net-mgmt/py-msrestazure: update to 0.5.1

• Switch to PyPi source
• PyPi source does not provide LICENSE file
• Change Log:
  • Bugfixes:
    • Fix CloudError if response and error message are provided at the same time #114
    • Fix LRO polling if last call is an empty Location (Autorest.Python 3.x only) #120
  • Features:
    • Altered resource id parsing logic to allow for resource group IDs #117