nitb: Filter ssh packets in pcap

Change-Id: I62a6ae7bd3a84baceb684c26727d2269c86ed023
diff --git a/src/osmo_gsm_tester/osmo_nitb.py b/src/osmo_gsm_tester/osmo_nitb.py
index 835bf13..13dfe27 100644
--- a/src/osmo_gsm_tester/osmo_nitb.py
+++ b/src/osmo_gsm_tester/osmo_nitb.py
@@ -53,7 +53,7 @@
 
         iface = util.ip_to_iface(self.addr())
         pcap_recorder.PcapRecorder(self.suite_run, self.run_dir.new_dir('pcap'), iface,
-                                   'host %s' % self.addr())
+                                   'host %s and port not 22' % self.addr())
 
         env = { 'LD_LIBRARY_PATH': util.prepend_library_path(lib) }