parsoid: systemuser is only for production

On labs/beta, the parsoid user has been added to LDAP with UID/GID 605
(bug 63329).  Hence move the generic system user creation under the
production role.

Change-Id: Ifa32751a52be96f3749b6a5d8694251a5aec3369
retab role/nova.pp

No code change, just replacing tabs with four spaces.

Change-Id: I5971cad7ef9cf643415d265a1cbbc10d4757a2dd
Merge "parsoid: systemuser is only for production" into production
Merge "retab role/nova.pp" into production