Up till now, cluster api controller cluster_template_id was a
property field loading the id from the DB every time. With this
change the field becomes of text type and mandatory, so wsme fwk
guarantees that the field is provided when needed.
Cluster objects will not load the cluster template on creation.
Instead cluster templates will be loaded when they are actually
needed.
story: 2006693
task: 36989
Co-Authored-By: Stavros Moiras <stavros.moiras@cern.ch>
Change-Id: I2313c6a8b647e521cfa476f9cec65ab286fa5a23