[clean,username_parser] Handle usernames with domain prefixes

In some configurations, we can expect usernames to be written as
`DOMAIN\user`, as well as the plain `user` form. Previously, the
domain-prefixed format would throw an exception in our obfuscation if
the letter after the `\` would cause the interpreter to regard that as a
special character.

Fix this by escaping the values passed to `get_regex_result()` so that
we can successfully compile a regex pattern object for domain-prefixed
usernames as well.

Further, when we encounter one of these usernames, the username parser
should automatically add an entry for the non-prefixed username as well.
While this will result in a secondary obfuscation match (due to the
current design of `sos clean`), this is preferable to potentially
leaving non-prefixed usernames in plaintext, if they happen to appear in
logs but not in any of our sourced files.

Related: RHBZ#2127977

Signed-off-by: Jake Hunsaker <jhunsake@redhat.com>

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