Az networking Linux

[Sploder12]

Adds subnets to AZs and assigns them to VMs made in that zone. This PR only covers Linux QEMU using dnsmasq.

MULTI-1942

[codecov]

Codecov Report

❌ Patch coverage is 96.05263% with 3 lines in your changes missing coverage. Please review.
✅ Project coverage is 89.50%. Comparing base (6c91f0b) to head (bf74556).
⚠️ Report is 8 commits behind head on availability-zones.

Files with missing lines	Patch %	Lines
...backends/qemu/linux/qemu_platform_detail_linux.cpp	94.73%	2 Missing ⚠️
...tform/backends/qemu/linux/dnsmasq_process_spec.cpp	96.29%	1 Missing ⚠️

Additional details and impacted files

@@                  Coverage Diff                   @@
##           availability-zones    #4071      +/-   ##
======================================================
+ Coverage               89.48%   89.50%   +0.02%     
======================================================
  Files                     268      268              
  Lines                   18003    18034      +31     
======================================================
+ Hits                    16110    16142      +32     
+ Misses                   1893     1892       -1     

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[xmkg]

Solid piece of work @Sploder12! I have a couple of comments.

[levkropp]

This seems to be the only use of protected DisabledCopyMove in the entire multipass codebase. Is there a reason for this change?

[Sploder12]

Yeah, QemuPlatformDetail::Subnet needs to derive DisabledCopyMove and because QemuPlatform already derives it as private QemuPlatformDetail::Subnet cannot access it. But it turns out this is because name lookup is going for the derived DisabledCopyMove and not multipass::DisabledCopyMove so being explicit removes the need to make this protected

[levkropp]

LGTM! Tested by launching a MySQL replication setup with SSL across 2 VMs in different zones and there were no issues with networking

[xmkg]

LGTM 👍 Tested locally, VM gets its IP address from AZ1. Also, the branch passes all the CLI tests too.

I've noticed that it takes longer to start the daemon on the first start, but the time is rather negligible. The subsequent daemon starts does not suffer from this.