Moving verify_on_setup into config.py

1]. Many failures in the ECMP testcases are seen in the end_vms.
Hence adding the verify_on_setup in the config part.
2]. The tests will call a config_and_verify in config.py, which will
in-turn call the config, wait_till_vm_is_up and verify_on_setup methods.

Change-Id: Iecb7655fe1cc071f5cc6cdaf487afeb935c768fb
Merge "Moving verify_on_setup into config.py"