Configure alex branch to not push anything but also uprev.

buildbot/cbuildbot_config.py

Index: buildbot/cbuildbot_config.py
diff --git a/buildbot/cbuildbot_config.py b/buildbot/cbuildbot_config.py
index 9c6c6454d853b71b865613ba41be065a3e0c2151..f2de6bef30808b546f04245bec1e025f2029cbd3 100644
--- a/buildbot/cbuildbot_config.py
+++ b/buildbot/cbuildbot_config.py
@@ -146,11 +146,11 @@ config['x86-mario-pre-flight-queue'].update({
 config['x86-alex-pre-flight-branch'] = default.copy()
 config['x86-alex-pre-flight-branch'].update({
   'board' : 'x86-alex',
-  'master' : True,
+  'master' : False,
 
-  'uprev' : False,
+  'uprev' : True,
   'rev_overlays': 'both',
-  'push_overlays': 'both',
+  'push_overlays': None,
 })
 
 config['x86-mario-pre-flight-branch'] = default.copy()