LBaaS tests refactoring

This patch set removes some redundant code from
LBaaS tests.

Closes-Bug: #1271108

Change-Id: I8d16b3c565d61b4bb45929ea0045b5d6cfa0bf25
Updated from global requirements

Change-Id: Ib047dac96fb3b67da4126c57b4eb1bb65202e712
Merge "Updated from global requirements"
Merge "LBaaS tests refactoring"