Improve network configuration of catlets

[ChristopherMann]

This PR improves the network configuration and fixes multiple issues. The improvements include:

• Proper support for flat networks
• Proper support for multiple provider subnets and IP pools (nat-overlay only supports a single subnet)
• Proper support for switching between virtual networks and network providers
• Improve configuration of host NetNat

Closes #269.

[fw2568]

This command fails:

PS C:\Users\Admin\Desktop> Get-VNetwork -ProjectName my


Id           : 13719414-4062-4611-9556-ca008be5038a
Name         : overlay
Project      : my (77855dd0-42cc-404d-b4fd-36cc8c724276)
Environment  : default
ProviderName : overlay
IpNetwork    : 172.16.0.0/20

Id           : 91ad10dd-42ae-40fe-a401-976cfedadc25
Name         : default
Project      : my (77855dd0-42cc-404d-b4fd-36cc8c724276)
Environment  : default
ProviderName : default
IpNetwork    : 10.0.0.0/20

Get-VNetwork : Value cannot be null.
Parameter name: ipNetwork
At line:1 char:1
+ Get-VNetwork -ProjectName my
+ ~~~~~~~~~~~~~~~~~~~~~~~~~~~~
    + CategoryInfo          : NotSpecified: (:) [Get-VNetwork], ArgumentNullException
    + FullyQualifiedErrorId : System.ArgumentNullException,Eryph.ComputeClient.Commands.Networks.GetVNetworksCommand

Project network:

version: 1.0
project: my
networks:
- name: default
  address: 10.0.0.0/20
  subnets:
  - name: default
    ip_pools:
    - name: default
      first_ip: 10.0.0.100
      last_ip: 10.0.0.240
      next_ip: 10.0.0.100
    dns_servers:
    - 9.9.9.9
    - 8.8.8.8
    mtu: 1400

- name: overlay
  provider: overlay
  address: 172.16.0.0/20
  subnets:
  - name: default
    ip_pools:
    - name: default
      first_ip: 172.16.0.10
      last_ip: 172.16.0.100
    dns_servers:
    - 9.9.9.9
    - 8.8.8.8
    mtu: 1400


- name: flat
  provider: lan

stops failing if I add

address: 192.168.112.0/24 (my test flat vlan) in project network.

[fw2568]

added #281 for the project routing issue

[sonarqubecloud]

Quality Gate passed

Issues
49 New issues
0 Accepted issues

Measures
0 Security Hotspots
0.0% Coverage on New Code
0.0% Duplication on New Code

See analysis details on SonarQube Cloud

[fw2568]

Please add a detection of eryph_default net NAT and removal when syncing networks (autosync mode).
My test setup was wrong, this considered already.

test error

[fw2568]

The only issue I found was caused by #281