Add rpmsign instead of using rpmbuild for rpms

[mimaslanka]

Signed-off-by: Michael Maslanka michael.maslanka@progress.com

Description

Change rpmbuild to no longer sign but instead use rpmsign. Rhel 8 also has gpg-agent running so we don't need the expect script for it.

---

Maintainers

Please ensure that you check for:

• [] If this change impacts git cache validity, it bumps the git cache
  serial number
• [] If this change impacts compatibility with omnibus-software, the
  corresponding change is reviewed and there is a release plan
• [] If this change impacts compatibility with the omnibus cookbook, the
  corresponding change is reviewed and there is a release plan