Many processes are not long running (e.g. hostapd_cli, ip, iw, etc)
and the separators written to log files don't show up for these which
makes debugging difficult. This is even true for IWD/Hostapd for tests
with start_iwd=0.
After writing separators for long running processes write them out for
any additional log files too.
Way too many classes have a dependency on the TestContext class, in
most cases only for is_verbose. This patch removes the dependency from
Process and Namespace classes.
For Process, the test arguments can be parsed in the class itself which
will allow for this class to be completely isolated into its own file.
The Namespace class was already relatively isolated. Both were moved
into utils.py which makes 'run-tests' quite a bit nicer to look at and
more fitting to its name.
