Update Network.Test to WindowsAzure.Management.Common 2.1.0
Add test for the bug fix.
Rethrow exception if the exception doesn't mean we are replacing the NSG for a subnet
Re-record all NSG scenario tests, including the new one.
Merge pull request #28 from dud5/nsgbugrethrow

Rethrow exception in Set-AzureNetworkSecurityGroupToSubnet