python-backports: ensure python-backports is not installed prior to packstack

Change-Id: I686ec7118da3ec25868c9015331f255c830f118e
remove rdopkg from node_prefix

Change-Id: Ib40a8cdc98028a4ba51508915934717644f00c2c
remove tags from collect_logs

Change-Id: Ia52e2515a87b032a811c464b9be3f77fd599ffd6