dump iptables in the worlddump

If we fail during devstack / grenade runs, it would be nice to have
the map of iptables that are currently active as well. This makes it
handy to start figuring out what's going on when test servers don't
ping.

Change-Id: Ia31736ef2cb0221586d30c089473dfdc1db90e23

tools/worlddump.py

@@ -61,6 +61,17 @@ File System Summary
     print dfraw
 
 
+def iptables_dump():
+    tables = ['filter', 'nat', 'mangle']
+    print """
+IP Tables Dump
+===============
+"""
+    for table in tables:
+        print os.popen("sudo iptables --line-numbers -L -nv -t %s"
+                       % table).read()
+
+
 def process_list():
     print """
 Process Listing
@@ -79,6 +90,7 @@ def main():
         os.dup2(f.fileno(), sys.stdout.fileno())
         disk_space()
         process_list()
+        iptables_dump()
 
 
 if __name__ == '__main__':