Bug 1286075: include redo in mach python path; r=gps

MozReview-Commit-ID: G34XOxlMDV7

--HG--
extra : rebase_source : 335aafa96b395c9f801bde26ae53234f309aded0

build/mach_bootstrap.py

@@ -53,6 +53,7 @@ SEARCH_PATHS = [
     'python/slugid',
     'python/py',
     'python/pytest',
+    'python/redo',
     'python/voluptuous',
     'build',
     'build/pymake',