Update parser to look at both sshd and sshd-session log lines (#1093)

Update parser to look at both sshd and sshd-session log lines (#1093)

This is a stripped down version of the following upstream commit in the
hub repository: c9c4fd0e5f7b2edc6c1d3367d0948123dc6e0120

There were a number of changes in the tests between our copy of the hub and
that commit, so let's focus on the actual code fix instead of trying to play
the “backport the context” game.

Gbp-Pq: Name 0021-backport-sshd-session-support.patch