tests: fix assumptions that expected no eth0 in system.
The previous commit added tests that would fail on any system that had
a nic named eth0 or eno1. The changes here supply the expected macs to
the function being tested so it does not query the system.
Instead of being dependent on the availability of syslog that
various distributions may not enable or configure correctly
or they do so via patches just use a known-to-work default
logging mechanism. If distros want to change this, that
is fine, but at least the built-in one will work reliably.
This replaces long single lines in a log or console output
with multiple lines that are much easier to read.
It indents the stdout and stderr so logs are more easily
read also.
cloudinit/config/cc_rh_subscription.py: Remove repos before adding
A user has pointed out that upon set up of a machine, users typically
remove repos (sometimes all of them) and then add repos in. This does
make sense for a typical user.
