fix(azure): handle unexpected exceptions during obtain_lease()

[KsenijaS]

Proposed Commit Message

fix(azure): handle unexpected exceptions during obtain_lease()

During DHCP we have seen various errors arising due to network interfaces being renamed during discovery.
e.g. cloud-init unhandled exception: FileNotFoundError(2, ''No such file or directory'')'
Add a guard to catch any unexpected exception to avoid unexpected propagation of exception, e.g. FileNotFoundError.

Additional Context

Test Steps

Merge type

• Squash merge using "Proposed Commit Message"
• Rebase and merge unique commits. Requires commit messages per-commit each referencing the pull request number (#<PR_NUM>)