Forcing become: true on the entire role was breaking the behavior
of the customize_home role dependency

This was only working when run under the vagrant user

These were no longer used as we don't need EL7 devel envs.
Of these roles, the postgresql_scl and nodejs_scl roles
are not used elsewhere in the project, and are dropped entirely.
The ruby_scl role remains as it is still used in hammer and
dynflow devel envs.