Unskip the test due to bugfix
Unskip the test due to bugfix

It was impossible to delete the last component from the env via
CLI. This bug is fixed in murano and corresponding test can be
upskipped.

Change-Id: I8c4867a4a91a038633322115b151c659c32742b2
Depends-on: I462072ad7c90eec1790b74cae958809aa316c25c
Related-bug: #1511645

openstack/python-muranoclient,openstack/python-muranoclient