Addressed the regression failures in ecmp and sec_mirroring

1]. In ecmp_test_resource, added a get_random_fip function
2]. Used the above function in test_ecmp
3]. Added verify_on_setup for the end VMs in a in-network-nat case.
4]. Corrected the svm_name in the analyser cases.

Change-Id: I6b4cb2f7cf355e1403c72a9485ad6b7f99163f10
Merge "Addressed the regression failures in ecmp and sec_mirroring"