Debuginfo RPMs are not being created as part of pkg-rpm build.

This is a side-affect of a fix for problems with short package names in current rpmbuild versions when built in chrooted. This was "fixed" in 1710 and 1801 by using a temporary build directory which had the unfortunate affect of disabling the building of debuginfo rpms.
See:
https://jira.fd.io/browse/VPP-1014
commits:
41988e58
5349f94d

With this JIRA, we propose reverse the above "fix" for from upstream vpp 1804 so Centos and RHEL developers can have access to debuginfo RPMs.
The original fix will be re-applied as a release number bump to the downstream release SRPM for RHEL and Centos.