patman: Add a call to get_maintainer.pl if it exists

For Linux the best way to figure out where to send a patch is with the
"get_maintainer.pl" script.  Add support for calling it from patman.
Support is added unconditionally for "scripts/get_maintainer.pl" in
case it is helpful for any other projects.

Signed-off-by: Doug Anderson <dianders@chromium.org>
diff --git a/tools/patman/series.py b/tools/patman/series.py
index 083af0f..6c5c570 100644
--- a/tools/patman/series.py
+++ b/tools/patman/series.py
@@ -22,6 +22,7 @@
 import itertools
 import os
 
+import get_maintainer
 import gitutil
 import terminal
 
@@ -225,6 +226,7 @@
             if process_tags:
                 list += gitutil.BuildEmailList(commit.tags)
             list += gitutil.BuildEmailList(commit.cc_list)
+            list += get_maintainer.GetMaintainer(commit.patch)
             all_ccs += list
             print >>fd, commit.patch, ', '.join(list)
             self._generated_cc[commit.patch] = list