correcting the instance id for FlowHandler task to -1, so that separate instance
doesn't run in parallel.

adding waitfor idle in Teardown for test_pkt_fip to avoid test case crash due
to pending clean up.

Change-Id: Ie6d87dac353c2833a3128e392ab883e25c33bdaf
Merge "correcting the instance id for FlowHandler task to -1, so that separate instance doesn't run in parallel."