MT#57982 Switch fully to keydb

We only support keydb now, and the config knob and migration script
have been removed. Hardcode keydb for the redis flavor we intend to
use, and add checks to make sure the redis service is not running nor
enabled anymore

Change-Id: I1a9ecb7e26346cd23618b464a7f5f420d5ab7263
(cherry picked from commit 716ea65865)

templates/400_process-debian.yaml.tt2

@@ -17,9 +17,12 @@ process:
   ntpd:
     running: [% ntp.backend == 'ntpd' ? 'true' : 'false ' %]
 
-  [% database.key_value.flavor %]-server:
+  keydb-server:
     running: true
 
+  redis-server:
+    running: false
+
   rsyslogd:
     running: true
 

templates/510_init-daemons-ngcp.yaml.tt2

@@ -96,10 +96,14 @@ service:
     enabled: [% general.process_handler == 'none' && is_lb && pushd.enable == "yes" ? 'true' : 'false' %]
     running: [% is_lb && pushd.enable == "yes" ? 'true' : 'false' %]
 
-  [% database.key_value.flavor %]-server.service:
+  keydb-server.service:
     enabled: [% redis.enable == "yes" ? 'true' : 'false' %]
     running: [% redis.enable == "yes" ? 'true' : 'false' %]
 
+  redis-server.service:
+    enabled: false
+    running: false
+
   slapd.service:
     enabled: [% is_mgmt && ldap.enable == "yes" ? 'true' : 'false' %]
     running: [% is_mgmt && ldap.enable == "yes" ? 'true' : 'false' %]