Revert "[release] Use RDO's Epoxy packages"

This reverts commit 64f171c.

Reason for revert: Let's switch to master

Change-Id: I28f474015ffd000a3c2cf4c461c3c2f2b8959b0b

Author: mnasiadka

kolla/common/config.py

@@ -40,7 +40,7 @@
 OPENSTACK_RELEASE = 'master'
 
 # This is noarch repository so we will use it on all architectures
-DELOREAN_DEPS = "https://trunk.rdoproject.org/centos9-epoxy/" \
+DELOREAN_DEPS = "https://trunk.rdoproject.org/centos9-master/" \
     "delorean-deps.repo"
 
 # TODO(mandre) check for file integrity instead of downloading from an HTTPS