Move test_restart and delete duplicated test_strength package

Change-Id: Iee79feae70cf61fbb23a3d3b1ee792c7f1b2decd
Move failover tests to seperate package

The tests were in test_ha.py. There was a decision
to move these tests to seperate package called
test_strength

Change-Id: Ib6551c4841fd636de6ef5d6bc704187a79b33129
Merge "Move test_restart and delete duplicated test_strength package"
Merge "Move failover tests to seperate package"