"HA Remove and use" test: add a wait  (#700)
"HA Remove and use" test: add a wait  (#700)

* Remove the "remove and rejoin" HA test

It tests the same thing that the "remove and use" test does

* "HA Remove and use" test: add a wait

* Also test the restclient directly

cloudify-cosmo/cloudify-system-tests,cloudify-cosmo/cloudify-system-tests