OpenFlow flows for table 17 now only appear after a port is created and
there is no longer a default flow during the deploy stage. Therefore
remove the check for table 17 existing during deployment.
Closes-Bug: 1781616
Change-Id: Ie988ba6a2d444a614e97c0edf5fce24b23970310
Signed-off-by: Tim Rozet <trozet@redhat.com>