[Bug 2126923] Re: ovn_dhcp4_global_options doesn't support keys with a list of values

[Leah Goldberg]

** Also affects: neutron (Ubuntu)
   Importance: Undecided
       Status: New

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https://bugs.launchpad.net/bugs/2126923

Title:
  ovn_dhcp4_global_options doesn't support keys with a list of values

Status in Ubuntu Cloud Archive:
  In Progress
Status in Ubuntu Cloud Archive caracal series:
  In Progress
Status in Ubuntu Cloud Archive dalmatian series:
  New
Status in Ubuntu Cloud Archive epoxy series:
  New
Status in Ubuntu Cloud Archive flamingo series:
  In Progress
Status in Ubuntu Cloud Archive gazpacho series:
  New
Status in neutron:
  Fix Released
Status in neutron package in Ubuntu:
  New

Bug description:
  When using `ovn_dhcp4_global_options` under `[ovn]` in `ml2_conf.ini`
  it will cause `neutron server` to crash when attempting to parse the
  configuration if a key provided contains a list seperated by commas.

  For example if setting `domain_search_list` with more than one domain.

  ```
  [ovn]
  ovn_dhcp4_global_options = domain_search_list:foo.bar,baz.qux
  ```

  Expected output would be that `neutron server` doesn't crash when
  attempting to parse such configuration and correctly applies these
  options within `OVN`.

  Experienced within OpenStack Epoxy.

  Not currently blocking anything as it is possible to patch
  `_get_ovn_dhcpv4_opts` in
  `neutron/plugins/ml2/drivers/ovn/mech_driver/ovsdb/ovn_client.py` with
  the following

  ```
  options['domain_search_list'] = "\"foo.bar,baz.qux\""
  ```

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