sources/azure: only wait for primary nic to be attached during restore

[anhvoms]

Proposed Commit Message

sources/azure: only wait for primary nic to be attached during restore

summary:
Currently DS Azure waits for all nics to be up and running during the 
restore phase of save-restore VMs. This change will alter the behavior
so that it will only wait for primary nic. This new behavior is consistent
with non-preprovisioning and running types.

Checklist:

• My code follows the process laid out in the documentation
• I have updated or added any unit tests accordingly
• I have updated or added any documentation accordingly

[TheRealFalcon]

LGTM, but do you plan on addressing the mock comment?

[anhvoms]

LGTM, but do you plan on addressing the mock comment?

Yep - please check latest iteration. Thanks!