Change: Don't fork gsad during container startup

Log all output of gsad to stderr, run gsad in foreground (don't fork)
and write output via tee to /var/log/gvm/gsad.log. This simplifies the
statup of gsad within the container and actually the running daemon
process is tracked by docker instead of the tail process.

.docker/gsad_log.conf

@@ -2,26 +2,26 @@
 prepend=%t %s %p
 separator=:
 prepend_time_format=%Y-%m-%d %Hh%M.%S %Z
-file=/var/log/gvm/gsad.log
+file=-
 level=127
 
 [gsad  gmp]
 prepend=%t %s %p
 separator=:
 prepend_time_format=%Y-%m-%d %Hh%M.%S %Z
-file=/var/log/gvm/gsad.log
+file=-
 level=127
 
 [gsad http]
 prepend=%t %s %p
 separator=:
 prepend_time_format=%Y-%m-%d %Hh%M.%S %Z
-file=/var/log/gvm/gsad.log
+file=-
 level=127
 
 [*]
 prepend=%t %s %p
 separator=:
 prepend_time_format=%Y-%m-%d %Hh%M.%S %Z
-file=/var/log/gvm/gsad.log
+file=-
 level=16

.docker/start-gsad.sh

@@ -1,9 +1,6 @@
 #!/bin/sh
 
-[ -z "$GSAD_ARGS" ] && GSAD_ARGS="--http-only"
+[ -z "$GSAD_ARGS" ] && GSAD_ARGS="-f --http-only"
 
 echo "starting gsad"
-gsad $GSAD_ARGS ||
-	(cat /var/log/gvm/gsad.log && exit 1)
-
-tail -f /var/log/gvm/gsad.log
+gsad $GSAD_ARGS 2>&1 | tee /var/log/gvm/gsad.log