Add rpmbuild utility scripts.

Three scripts are added to help when working with RPMs:
- setbuildrpm.sh: Used to setup an environment to build RPMs.
- odlrepo.sh: Used to setup a local repo with the built RPMs.
- checkint: Used to validate the RPMs against the integration builds.

All the scripts have "-?" text to show the options and usage.

Change-Id: I512d815242463160e8420d23dcf2b2f621c3dfd1
Signed-off-by: Sam Hague <shague@redhat.com>
(cherry picked from commit f3d6582b36240808c479106f2039b1b2e6d206c9)