Correct repo_id_map for hdp 2.5
Correct repo_id_map for hdp 2.5

When hdp2.5 cluster installation is done with off-line
repo,hdp-utils repo name should be HDP-UTILS-1.1.0.21.
However this is hardcoded wrongly in sahara repo_id_map
as HDP-UTILS-1.1.0.20.As a result Ambari HDP repo set up
fails.
This fix will correct the repo_id_map

Change-Id: Ibf7d341cc2d2a53be521039d4f843cdbc5ee880b
Story: #2003654
Task: #26067

openstack/sahara,openstack/sahara