make flow action suite more robust

make flow action suite more robust

-  some systems give slightly different output to ifconfig so adding a more
   complete cleanup step from the ovsdb library.  it will stop/wipe db/start
   openvswitch which should ensure no leftovers will be there

-  when running this suite on a single vm setup where the ssh to the "mininet
   system" is only to localhost, it is happening too fast and the flows are
   not added/removed to the local ovs when it checks.  so adding a quick little
   wuks (3s/1s) to account for that.

Change-Id: I0c690c2951af7b22d0bdb1b48e89c111f07ccf90
Signed-off-by: Jamo Luhrsen <jluhrsen@redhat.com>