This implementation provides classes to extract systemd-journald records
with OpenVPN 3 Linux related log entries, in addition to provider
filtering possibilities to help narrow down the scope.

The src/tests/misc/journal-log-parse-test test program provides a naive
implementation with basic filtering possibilities.

To be able to extract log entries, the program must be run as root.

Signed-off-by: David Sommerseth <davids@openvpn.net>