[Azure] Fix check for NSG creation while opening port

[landscapepainter]

Regards to nsg.provisioning_state not in ['Creating', 'Updating'] at provision/azure/instance.py::open_ports, it seems like we are waiting until the provisioning_state is updated to move on from either 'Creating' or 'Updating'. But nsg.provisioning_state would not be updated as the .provisioning_state does not stay synced with Azure's backend unless we refresh by calling list_network_security_groups(resource_group) again. Hence, current bug stays in an infinite loop when nsg.provisioning_state was either 'Creating' or 'Updating' when first list_network_security_groups(resource_group)was called within the for-loop.

We must add a logic to refresh by calling list_network_security_groups(resource_group) each time the check fails.

Version & Commit info:

• sky -v: PLEASE_FILL_IN
• sky -c: PLEASE_FILL_IN