Add a script to validate consistent run of UT

Make following tests run consistently
   - test_cmn
   - test_subop
   - test_agent_init
   - test_vmware
   - test_ping
   - test_kstate
   - test_sandesh_kstate
   - test_vnswif
   - test_intf

Change-Id: Ia50c01ce962b6a4fc0338b9681358b0490bfd658
Merge "Add a script to validate consistent run of UT"