MT#6807 Adjust getty check for usage with systemd

Check for getty process without path information and arguments,
because on systemd powered systems we have:

| /sbin/agetty tty1 38400

while sysvinit powered systemd run:

| /sbin/getty 38400 tty1
| /sbin/getty 38400 tty2
| /sbin/getty 38400 tty3
| /sbin/getty 38400 tty4
| /sbin/getty 38400 tty5
| /sbin/getty 38400 tty6

As soon as one "getty" process is available that should be fine enough
for us, no matter whether it's /sbin/agetty or /sbin/getty.
(Of course it would be even better if we'd have regex support
in the tests, but that's not available in upstream code...)

ce/test-server.yaml

@@ -9,7 +9,7 @@ running-processes:
         - collectd -C /etc/collectd/collectd.conf -f
         - nginx
         - rate-o-mat
-        - /sbin/getty 38400 tty
+        - getty
         - udevd
         - /usr/bin/logger -p daemon.info -t oss
         - lua5.1 /usr/bin/prosody

pro/test-server.yaml

@@ -21,7 +21,7 @@ running-processes:
         - "ha_logd: read process"
         - /usr/sbin/hb_watchdog
         - rate-o-mat
-        - /sbin/getty 38400 tty
+        - getty
         - udevd
         - /usr/bin/logger -p daemon.info -t oss
         - lua5.1 /usr/bin/prosody