Add ironic-inspector-client to rocky-py3-uc
Add ironic-inspector-client to rocky-py3-uc

Support for python3 has been added in [1], so it's time to
add it to the fedora python3 builder.

[1] https://review.rdoproject.org/r/#/c/13926/

Change-Id: I27eb1a7da9ecd500cc3273c855e24e89f3e964c5

redhat-openstack/rdoinfo,javierpena/rdoinfo