Fix remote BIRD prompt line removal

Prompt - like "bird>" is removed from each and every line parsed. And
only first two lines are unconditialnally droped. Although this is not
the final solution (like rewriting (p)expect or choosing different one)
this should work for me at least for now.

src/ulgbird.py

@@ -606,13 +606,13 @@ class BirdRouterRemote(ulgmodel.RemoteRouter,BirdRouter):
 
         def stripFirstLines(string):
             lines = str.splitlines(string)
-            r = re.sub(BIRD_CONSOLE_PROMPT_REGEXP,'',lines[2]) + '\n'
-            for l in lines[3:]:
-                r = r + l + '\n'
+            r = ''
+            for l in lines[2:]:
+                r = r + re.sub(BIRD_CONSOLE_PROMPT_REGEXP,'',l) + '\n'
             return r
 
         out = s.before
-#        ulgmodel.debug("BIRD OUT: "+out)
+        ulgmodel.debug("BIRD OUT: "+out)
         outfile.write(stripFirstLines(out))
 
     def rescanPeers(self):