This adds microversion 1.46 to allow:
* returning conductor_group in the node object
* specifying conductor_group in the node create API
* specifying conductor_group in the node update API
* allow filtering nodes by conductor_group
Change-Id: I32e0333c78cfcb2d88dfd4f70f0be012dcfef407
Story: 2001795
Task: 22643