Removed explicit passing of version to the murano-api endpoint

Requires python-muranoclient change Idc72c36a36fc2cd57ea02a156838742ace990633

Partially-closes bug: #1298477

Change-Id: Ic2bbdc6bdd55f1e1d5f7958126ccbad834cbba4c
Merge "Removed explicit passing of version to the murano-api endpoint"