[Bug 1765283] [NEW] Not able to clear all host-routes configured on a subnet using --no-host-routes option

[Arunkumar Murukesan]

Public bug reported:

When i try to clear host routes configured on a subnet using --no-host-
route option, I am getting HTTPException

Please find the below logs for more clarity.

https://bugs.launchpad.net/devstack/+bug/1765026

Log:
----
stack at pike-ctrl:~/devstack$ git branch
  master
* stable/pike

stack at pike-ctrl:~/devstack$ openstack subnet show SUBNET1
+-------------------------+----------------------------------------------------+
| Field | Value |
+-------------------------+----------------------------------------------------+
| allocation_pools | 10.10.10.2-10.10.10.254 |
| cidr | 10.10.10.0/24 |
| created_at | 2018-04-18T11:32:48Z |
| description | |
| dns_nameservers | |
| enable_dhcp | True |
| gateway_ip | 10.10.10.1 |
| host_routes | destination='10.20.20.0/24', gateway='10.10.10.56' |
| | destination='10.30.30.0/24', gateway='10.10.10.57' |
| | destination='10.40.40.0/24', gateway='10.10.10.58' |
| | destination='10.50.50.0/24', gateway='10.10.10.62' |
| id | 4edd7300-0bd8-400b-ae49-813b5613cf76 |
| ip_version | 4 |
| ipv6_address_mode | None |
| ipv6_ra_mode | None |
| name | SUBNET1 |
| network_id | f2e5943e-9f94-428b-ac00-7dcfe1f290fd |
| project_id | ac38171bdded4720b5a906099c8779ad |
| revision_number | 4 |
| segment_id | None |
| service_types | |
| subnetpool_id | None |
| tags | |
| updated_at | 2018-04-18T11:34:55Z |
| use_default_subnet_pool | None |
+-------------------------+----------------------------------------------------+
stack at pike-ctrl:~/devstack$ openstack subnet set SUBNET1 --no-host-route
HttpException: Bad Request (HTTP 400) (Request-ID: req-d4e949ee-a410-4817-804a-6d998688fdd1), Invalid input for host_routes. Reason: Invalid data format for hostroute: ''.
stack at pike-ctrl:~/devstack$

stack at pike-ctrl:~/devstack$ openstack subnet set SUBNET1 --help
usage: openstack subnet set [-h] [--name <name>] [--dhcp | --no-dhcp]
                            [--gateway <gateway>]
                            [--description <description>] [--tag <tag>]
                            [--no-tag]
                            [--allocation-pool start=<ip-address>,end=<ip-address>]
                            [--no-allocation-pool]
                            [--dns-nameserver <dns-nameserver>]
                            [--no-dns-nameservers]
                            [--host-route destination=<subnet>,gateway=<ip-address>]
                            [--no-host-route] [--service-type <service-type>]
                            <subnet>

  --no-host-route Clear associated host-routes from the subnet. Specify
                        both --host-route and --no-host-route to overwrite the
                        current host route information.

** Affects: python-openstackclient (Ubuntu)
     Importance: Undecided
         Status: New

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https://bugs.launchpad.net/bugs/1765283

Title:
  Not able to clear all host-routes configured on a subnet using --no-
  host-routes option

Status in python-openstackclient package in Ubuntu:
  New

Bug description:
  When i try to clear host routes configured on a subnet using --no-
  host-route option, I am getting HTTPException

  Please find the below logs for more clarity.

  https://bugs.launchpad.net/devstack/+bug/1765026

  Log:
  ----
  stack at pike-ctrl:~/devstack$ git branch
    master
  * stable/pike

  stack at pike-ctrl:~/devstack$ openstack subnet show SUBNET1
  +-------------------------+----------------------------------------------------+
  | Field | Value |
  +-------------------------+----------------------------------------------------+
  | allocation_pools | 10.10.10.2-10.10.10.254 |
  | cidr | 10.10.10.0/24 |
  | created_at | 2018-04-18T11:32:48Z |
  | description | |
  | dns_nameservers | |
  | enable_dhcp | True |
  | gateway_ip | 10.10.10.1 |
  | host_routes | destination='10.20.20.0/24', gateway='10.10.10.56' |
  | | destination='10.30.30.0/24', gateway='10.10.10.57' |
  | | destination='10.40.40.0/24', gateway='10.10.10.58' |
  | | destination='10.50.50.0/24', gateway='10.10.10.62' |
  | id | 4edd7300-0bd8-400b-ae49-813b5613cf76 |
  | ip_version | 4 |
  | ipv6_address_mode | None |
  | ipv6_ra_mode | None |
  | name | SUBNET1 |
  | network_id | f2e5943e-9f94-428b-ac00-7dcfe1f290fd |
  | project_id | ac38171bdded4720b5a906099c8779ad |
  | revision_number | 4 |
  | segment_id | None |
  | service_types | |
  | subnetpool_id | None |
  | tags | |
  | updated_at | 2018-04-18T11:34:55Z |
  | use_default_subnet_pool | None |
  +-------------------------+----------------------------------------------------+
  stack at pike-ctrl:~/devstack$ openstack subnet set SUBNET1 --no-host-route
  HttpException: Bad Request (HTTP 400) (Request-ID: req-d4e949ee-a410-4817-804a-6d998688fdd1), Invalid input for host_routes. Reason: Invalid data format for hostroute: ''.
  stack at pike-ctrl:~/devstack$

  stack at pike-ctrl:~/devstack$ openstack subnet set SUBNET1 --help
  usage: openstack subnet set [-h] [--name <name>] [--dhcp | --no-dhcp]
                              [--gateway <gateway>]
                              [--description <description>] [--tag <tag>]
                              [--no-tag]
                              [--allocation-pool start=<ip-address>,end=<ip-address>]
                              [--no-allocation-pool]
                              [--dns-nameserver <dns-nameserver>]
                              [--no-dns-nameservers]
                              [--host-route destination=<subnet>,gateway=<ip-address>]
                              [--no-host-route] [--service-type <service-type>]
                              <subnet>

    --no-host-route Clear associated host-routes from the subnet. Specify
                          both --host-route and --no-host-route to overwrite the
                          current host route information.

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