MT#6389 Do not check exect tty number (check general avialability)

We are not going to check exect tty numer avialability,
otherwise test will failed in case is someone loged in to
this console. Lets check at least some terminal avialability.

ce/test-server.yaml

@@ -9,7 +9,7 @@ running-processes:
         - collectd -C /etc/collectd/collectd.conf -f
         - nginx
         - rate-o-mat
-        - /sbin/getty 38400 tty1
+        - /sbin/getty 38400 tty
         - udevd --daemon
         - /usr/bin/logger -p daemon.info -t oss
         - lua5.1 /usr/bin/prosody