Clean up build jobs for R2

Clean up build jobs for R2

Since the Pypi upload is still not fully working yet
(helpdesk ticket #44260), it is best to remove pypi
related jobs for now from the dcaegen2-utils definition
so the R2 release manager can have a cleaner view.  We
will add back these jobs after the R2 branch is cut to
resume the integration with LF Pypi server.
Also removing job definitions for de-scoped projects.

Issue-ID: DCAEGEN2-206
Change-Id: I7e5d2a3cc3d05e5b7befbf1d80595253e8843965
Signed-off-by: Lusheng Ji <lji@research.att.com>