[6.13.z] Add logging to Satellite-xdist worker assignment process

[Satellite-QE]

Cherrypick of PR: #14539

Problem Statement

There were situations in the past where I would be more than grateful for a context of what is happening in align_to_satellite fixture.

Solution

This PR adds logging to the fixture. That should help during the log investigation.

Related Issues

none

[Satellite-QE]

trigger: test-robottelo
pytest: tests/foreman -n2 -k 'test_negative_list_ignored_by_name[memoryfree] or test_positive_ping[root]'

[Satellite-QE]

PRT Result

Build Number: 6620
Build Status: SUCCESS
PRT Comment: pytest tests/foreman -n2 -k test_negative_list_ignored_by_name[memoryfree] or test_positive_ping[root] --external-logging
Test Result : ================ 2 passed, 10635 warnings in 960.71s (0:16:00) =================