beta: skip mwdeploy user creation

In labs, the mwdeploy user is provisionned via LDAP, so skip the user
creation entirely.  The homedir needs to be created by puppet though.

Change-Id: Ie232d8337e7b4dc4b80b3b43eceae3ab597b47b3
Merge "beta: skip mwdeploy user creation" into production