Revert "Fix rtd verify job choosing strategy"

This reverts commit c02c7a2ac05e3a9b987edc15d555a5124a2ad976.

Reason for revert: Acumos RTD jobs are triggered by commits to ANY Acumos repo on a *.rst file.  This change causes the doc job to checkout the commit ID from that other repo, which is never present in the doc repo.

Issue-ID: RELENG-911
Change-Id: Icab10bb8b0e3e3cc28458751a9de1edf88fdc3d7
Signed-off-by: Lott, Christopher (cl778h) <cl778h@att.com>