CI: Use correct TD agent repository version

Change-Id: Ic8c212111301d6b144e3aa0fe124b022b0296ec6

playbooks/kayobe-overcloud-host-configure-base/overrides.yml.j2

@@ -121,7 +121,7 @@ dnf_epel_mirror_directory: 'epel'
 # Configure a custom DNF repository.
 dnf_custom_repos:
   td-agent:
-    baseurl: http://packages.treasuredata.com/3/redhat/$releasever/$basearch
+    baseurl: http://packages.treasuredata.com/4/redhat/$releasever/$basearch
     gpgkey: https://packages.treasuredata.com/GPG-KEY-td-agent
     gpgcheck: yes
 # Enable DNF Automatic.