This change ensures that catalogue CRs (i.e. networking,
versions) are validated when running validate_docs script.
Also fixes:
* problem encountered with the creation of the ironic-vars
ConfigMap when a non-string data type was used as the
replacement target value.
* amends VersionsCatalogue schema to allow an optional
'ipam-manager' object in capi_images, necessitated by
a change to the capm3 function[0].
[0] https://review.opendev.org/c/airship/airshipctl/+/780297
Closes: #476
Change-Id: Idd05eb046e411b757b7d4f7b21a9b89b6cc51bb6
7222467df3