dispatch: take over SignalInterrupt handling from scmutil

dispatch handles KeyboardInterrupt already. This makes the code more
consistent, and makes worker not print "killed!" if it receives SIGTERM in
most cases (in rare cases there is still "killed!" printed, which will be
fixed by the next patch).

mercurial/dispatch.py

@@ -162,9 +162,13 b' def dispatch(req):'
     ret = None
     try:
         ret = _runcatch(req)
-    except KeyboardInterrupt:
+    except KeyboardInterrupt as inst:
         try:
-            req.ui.warn(_("interrupted!\n"))
+            if isinstance(inst, error.SignalInterrupt):
+                msg = _("killed!\n")
+            else:
+                msg = _("interrupted!\n")
+            req.ui.warn(msg)
         except error.SignalInterrupt:
             # maybe pager would quit without consuming all the output, and
             # SIGPIPE was raised. we cannot print anything in this case.

mercurial/scmutil.py

@@ -186,8 +186,6 b' def callcatch(ui, func):'
         ui.warn(_("abort: file censored %s!\n") % inst)
     except error.RevlogError as inst:
         ui.warn(_("abort: %s!\n") % inst)
-    except error.SignalInterrupt:
-        ui.warn(_("killed!\n"))
     except error.InterventionRequired as inst:
         ui.warn("%s\n" % inst)
         if inst.hint: