patman: Correct unit tests to run correctly

It seems that doctest behaves differently now, and some of the unit tests
do not run. Adjust the tests to work correctly.

 ./tools/patman/patman --test
<unittest.result.TestResult run=10 errors=0 failures=0>

Signed-off-by: Simon Glass <sjg@chromium.org>
diff --git a/tools/patman/gitutil.py b/tools/patman/gitutil.py
index e2b4959..29e6fdd 100644
--- a/tools/patman/gitutil.py
+++ b/tools/patman/gitutil.py
@@ -478,13 +478,13 @@
     ...
     OSError: Recursive email alias at 'other'
     >>> LookupEmail('odd', alias, raise_on_error=False)
-    \033[1;31mAlias 'odd' not found\033[0m
+    Alias 'odd' not found
     []
     >>> # In this case the loop part will effectively be ignored.
     >>> LookupEmail('loop', alias, raise_on_error=False)
-    \033[1;31mRecursive email alias at 'other'\033[0m
-    \033[1;31mRecursive email alias at 'john'\033[0m
-    \033[1;31mRecursive email alias at 'mary'\033[0m
+    Recursive email alias at 'other'
+    Recursive email alias at 'john'
+    Recursive email alias at 'mary'
     ['j.bloggs@napier.co.nz', 'm.poppins@cloud.net']
     """
     if not alias: