[Bug 2015022] [NEW] Netplan not merging routes in separate files

[Husam Bilal]

Public bug reported:

Adding extra static routes in a separate configuration file doesn't seem
to get merged.

Release info:
```
Distributor ID:	Ubuntu
Description:	Ubuntu 22.04 LTS
Release:	22.04
Codename:	jammy
```

Example config files:
```
# /etc/netplan/00-config.yaml
network:
  version: 2
  ethernets:
    ens5:
      dhcp4: true
      dhcp6: false
      dhcp4-overrides:
        use-routes: false
      routes:
        - to: 172.31.0.0/16
          via: 172.31.0.1
```
```
# /etc/netplan/10-config.yaml
network:
  version: 2
  ethernets:
    ens5:
      routes:
        - to: 172.18.0.0/24
          via: 172.31.1.240
```

Running `netplan --debug get` returns the following output:
```
** (process:1249606): DEBUG: 00:42:14.001: starting new processing pass
** (process:1249606): DEBUG: 00:42:14.001: ens5: adding new route
** (process:1249606): DEBUG: 00:42:14.001: We have some netdefs, pass them through a final round of validation
** (process:1249606): DEBUG: 00:42:14.001: ens5: setting default backend to 1
** (process:1249606): DEBUG: 00:42:14.001: Configuration is valid
network:
  version: 2
  ethernets:
    ens5:
      dhcp4: true
      dhcp4-overrides:
        use-routes: false
      dhcp6: false
      routes:
      - to: "172.31.0.0/16"
        via: "172.31.0.1"
```

** Affects: netplan
     Importance: Undecided
         Status: New

** Also affects: netplan.io (Ubuntu)
   Importance: Undecided
       Status: New

** No longer affects: netplan.io (Ubuntu)

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https://bugs.launchpad.net/bugs/2015022

Title:
  Netplan not merging routes in separate files

Status in netplan:
  New

Bug description:
  Adding extra static routes in a separate configuration file doesn't
  seem to get merged.

  Release info:
  ```
  Distributor ID:	Ubuntu
  Description:	Ubuntu 22.04 LTS
  Release:	22.04
  Codename:	jammy
  ```

  Example config files:
  ```
  # /etc/netplan/00-config.yaml
  network:
    version: 2
    ethernets:
      ens5:
        dhcp4: true
        dhcp6: false
        dhcp4-overrides:
          use-routes: false
        routes:
          - to: 172.31.0.0/16
            via: 172.31.0.1
  ```
  ```
  # /etc/netplan/10-config.yaml
  network:
    version: 2
    ethernets:
      ens5:
        routes:
          - to: 172.18.0.0/24
            via: 172.31.1.240
  ```

  Running `netplan --debug get` returns the following output:
  ```
  ** (process:1249606): DEBUG: 00:42:14.001: starting new processing pass
  ** (process:1249606): DEBUG: 00:42:14.001: ens5: adding new route
  ** (process:1249606): DEBUG: 00:42:14.001: We have some netdefs, pass them through a final round of validation
  ** (process:1249606): DEBUG: 00:42:14.001: ens5: setting default backend to 1
  ** (process:1249606): DEBUG: 00:42:14.001: Configuration is valid
  network:
    version: 2
    ethernets:
      ens5:
        dhcp4: true
        dhcp4-overrides:
          use-routes: false
        dhcp6: false
        routes:
        - to: "172.31.0.0/16"
          via: "172.31.0.1"
  ```

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