inotify: catch SignalInterrupt during shutdown (issue3351)

When inotify.repowatcher.shutdown() is called, mercurial.error.SignalInterrupt
exception is thrown by mercurial.dispatch._runcatch.catchterm(), therefore
socketlistener.shutdown() is not called.

Catching this allows cleanup action (removing the socket file) to proceed.

hgext/inotify/linuxserver.py

@@ -7,7 +7,7 b''
 # GNU General Public License version 2 or any later version.
 
 from mercurial.i18n import _
-from mercurial import osutil, util
+from mercurial import osutil, util, error
 import server
 import errno, os, select, stat, sys, time
 
@@ -431,7 +431,10 b' class master(object):'
 
     def shutdown(self):
         for obj in pollable.instances.itervalues():
-            obj.shutdown()
+            try:
+                obj.shutdown()
+            except error.SignalInterrupt:
+                pass
 
     def run(self):
         self.repowatcher.setup()