Updated Public IP code to incorporate gem update changes
Updated Public IP code to incorporate gem update changes

Summary: Updated Public IP code to work with updated network gem. Updated azure_mgmt_network from 0.2.1 -> 0.5.0

Test Plan: N/A

Subscribers: omair.sajid

Differential Revision: http://phabricator.confiz.com/D7822

fog/fog-azure-rm,vishrutshah/fog-azure-rm,bilal-naeem-confiz/fog-azure-rm,vishrutshah/fog-azure-rm,fog/fog-azure-rm,bilal-naeem-confiz/fog-azure-rm