[cifmw_cephadm] Add cifmw_cephadm_rpm_url

[fultonj]

If cifmw_cephadm_rpm_url (default "") is non-empty and set to a valid URL to an RPM (e.g. http://foo.com/cephadm.rpm), then the install_cephadm.yml tasks file will install cephadm from that URL instead of the repository. This option will go unnoticed, since it defaults to "", unless overridden.

Jira: OSPRH-31757

[openshift-ci]

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[fultonj]

This achieved the desired result in a test project.

In an HCI deploy (gamma) I was able to have rhos-release install RHCSv9 but install an RHCSv7 server.

[zuul@compute-azl02vg1-0 ~]$ rpm -qa | grep ceph
cephadm-18.2.1-399.el9cp.noarch
python3-ceph-argparse-20.2.1-298.el9cp.x86_64
python3-ceph-common-20.2.1-298.el9cp.x86_64
libcephfs-proxy2-20.2.1-298.el9cp.x86_64
libcephfs2-20.2.1-298.el9cp.x86_64
python3-cephfs-20.2.1-298.el9cp.x86_64
ceph-common-20.2.1-298.el9cp.x86_64
[zuul@compute-azl02vg1-0 ~]$