This is the first step in creating this repository from the legacy openbsc.git.
Like all other Osmocom repositories, keep the autoconf and automake files in
the repository root. openbsc.git has been the sole exception, which ends now.
This patch adds optional parameters to pass the state file, the
destination address (default 127.0.0.1), the destination port
(default 4000), the source port (default 0). So it is called as
gst rtp_replay.st -a [FILE [HOST [SOURCEPORT [DESTPORT]]]]
In addition, nonexistant FILEs are no longer created but opened
Sponsored-by: On-Waves ehf