Always run OSGi HTTP service on random port in itests (#11523)

It is probably always a good idea to run the OSGi HTTP service on a random available port in itests.
So when this is always done it prevents future issues and removes a bit of duplication.

Signed-off-by: Wouter Born <github@maindrain.net>

itests/org.openhab.binding.feed.tests/itest.bndrun

@@ -14,8 +14,6 @@ Fragment-Host: org.openhab.binding.feed
 -runblacklist: \
 	bnd.identity;id='org.openhab.core.storage.json'
 
--runvm: -Dorg.osgi.service.http.port=${org.osgi.service.http.port}
-
 #
 # done
 #