Remove unnecessary rmtree call
Remove unnecessary rmtree call

The clear() method is calling rmtree() to delete cache folder
but the call is being made twice. The second call is unnecessary.

Change-Id: I78b0ed2417b3775604816bf078abedce79406edd
Closes-Bug: #1513010

openstack/murano-agent,openstack/murano-agent,openstack/murano-agent,openstack/murano-agent