Adding openstack-sdk-dotnet, openstack-cli-powershell,
openstackclient, and python-openstacksdk to gerritbot config.

Change-Id: I9cf99a41e271f771cd060ecb2f1c16152f59b648
Merge "Adding openstack-sdk-dotnet, openstack-cli-powershell, openstackclient, and python-openstacksdk to gerritbot config."