v0.4.51 checks datacenter-create type. Upon datacenter-attach, propagates vim...

v0.4.51 checks datacenter-create type. Upon datacenter-attach, propagates vim credentials to vimconnector class constructor, so that credentiasl checks can be done

Change-Id: I7d60cc46b34fa4fed31e886ba8cd0bf3d4f8c976
Signed-off-by: tierno <alfonso.tiernosepulveda@telefonica.com>