use installInfra function

* use installInfra
* Added separated step for deploy keepalived and rabbitMQ.
* Fixed etcd check.

installInfra function is capable to detect targets and install only
required services.

installOpenstackInfra and installKubernetesInfra are now obsolete

Change-Id: I5159acf7ba27b253b1eed2f2aa390635a8a2f9ae
2 files changed