[1LP][RFR] Add test_infrastructure_hosts_tagging

[prichard77]

Purpose or Intent

• Adding tests for host tagging to replace manual test, test_host_tagging.
  version1.2.3.

PRT Run

{{ pytest: cfme/tests/infrastructure/test_host.py::test_infrastructure_hosts_tagging }}

[digitronik]

Thanks for automating this test @prichard77
some comments have a glance.

[digitronik]

It may raise IndexError if not single host available for testing.
Its rare case but we can handle this and try to skip test if possible.

[prichard77]

I believe we have been assuming that there will be at lest one host. There always is with the providers we use for host testing. I created a fixture previously that checked for min hosts when we needed more than one. But it hasn't been used to check for just one. There are many tests in test_host.py that do this. If we really want to check I can add one, but it's not been the convention.

[digitronik]

Yup, I agreed that's why added rare case scenario like removal of host.