Increase MIN_DOMAIN_LEVEL to DOMAIN_LEVEL_1

With increasing the minimal domain level to 1 ipa-replica-install will
refuse to install if the domain has domain level 0.

See: https://pagure.io/freeipa/issue/7669
Signed-off-by: Thomas Woerner <twoerner@redhat.com>
Reviewed-By: Christian Heimes <cheimes@redhat.com>

ipalib/constants.py

@@ -255,7 +255,7 @@ SID_ANCHOR_PREFIX = ':SID:'
 DOMAIN_LEVEL_0 = 0  # compat
 DOMAIN_LEVEL_1 = 1  # replica promotion, topology plugin
 
-MIN_DOMAIN_LEVEL = DOMAIN_LEVEL_0
+MIN_DOMAIN_LEVEL = DOMAIN_LEVEL_1
 MAX_DOMAIN_LEVEL = DOMAIN_LEVEL_1
 
 # Constants used in generation of replication agreements and as topology