Change to Ansible core modules devel branch

Switching to the devel branch until the submodule
pointer gets updated so bifrost is operational again.

This was due to the Ansible mysql_user module breaking when
no configuration file was explicitly set.  A fix has been landed
however the pointer for the main Ansible repo naturally lags
behind the current development state of the modules repo.

scripts/env-setup.sh

@@ -38,7 +38,10 @@ else
     git pull --rebase
     git submodule update --init --recursive
     git fetch
-
+    # Temporary direct checkout of devel due to broken modules until
+    # the submodules pointers get updated in the core ansible repo.
+    cd lib/ansible/modules/core
+    git checkout devel
 fi
 
 echo