[Finishes #80253548] Merge back to using one version of roboconf

Assumptions for this PR from [Pivotal story](https://www.pivotaltracker.com/story/show/80253548):

Main requirements changes:

1.  No longer offer auto-update since this will be handled by the submodule developers.  I.e. if they update a submodule, then they are responsible for updating the relevant parent project SHAs.  This carries over even into Jenkins deployments, since Jenkins cannot assume submodule SHA configuration.
1.  No presumption of only `master` branch for submodules; submodules can have their own branches.

Due to primarily the removal of auto-update, many bash functions are no longer required.