Fixed issue with waiting for ssh of deleted cluster
Fixed issue with waiting for ssh of deleted cluster

If we will delete cluster during waiting for ssh,
check_cluster_exists will be unreachable. 
We should move it up.

Change-Id: I3935269ad7b8a771490f193653d73b17d4b30708
Closes-bug: 1439396
esikachev/sahara-backup,redhat-openstack/sahara,crobby/sahara,crobby/sahara,esikachev/sahara-backup,zhujzhuo/Sahara,openstack/sahara,matips/iosr-2015,tellesnobrega/sahara,redhat-openstack/sahara,zhujzhuo/Sahara,redhat-openstack/sahara,bigfootproject/sahara,egafford/sahara,esikachev/sahara-backup,zhangjunli177/sahara,ekasitk/sahara,matips/iosr-2015,bigfootproject/sahara,ekasitk/sahara,tellesnobrega/sahara,zhangjunli177/sahara,openstack/sahara,henaras/sahara,matips/iosr-2015,henaras/sahara,zhangjunli177/sahara,bigfootproject/sahara,ekasitk/sahara,zhujzhuo/Sahara,crobby/sahara,henaras/sahara,egafford/sahara