Fix enabled tripleo-validations check

With the move from instack-undercloud to containerized undercloud, the
hiera key to check for whether the tripleo-validations are enabled
changed from `enable_validations` to `tripleo_validations_enabled`. This
commit updated the check in undercloud_post.sh to use the right key. It
also removed the useless EnableValidation heat param.

Change-Id: I338e139fa770ebb7bdcc1c0afb79eec062fada8b

extraconfig/post_deploy/undercloud_post.sh

@@ -136,7 +136,7 @@ if [ "$(hiera mistral_api_enabled)" = "true" ]; then
       openstack workflow env create $TMP_MISTRAL_ENV
   fi
 
-  if [ "$(hiera enable_validations)" = "true" ]; then
+  if [ "$(hiera tripleo_validations_enabled)" = "true" ]; then
       echo Execute copy_ssh_key validations
       openstack workflow execution create tripleo.validations.v1.copy_ssh_key
 

extraconfig/post_deploy/undercloud_post.yaml

@@ -37,11 +37,6 @@ parameters:
     description: The user password for SNMPd with readonly rights running on all Overcloud nodes
     type: string
     hidden: true
-  EnableValidations:
-    default: false
-    description: >
-      Whether the TripleO validations are enabled.
-    type: boolean
   DnsServers:
     default: []
     description: >
@@ -104,7 +99,6 @@ resources:
         - name: admin_password
         - name: auth_url
         - name: snmp_readonly_user_password
-        - name: enable_validations
         - name: internal_tls_ca_file
       config: {get_file: ./undercloud_post.sh}
 
@@ -119,7 +113,6 @@ resources:
         homedir: {get_param: UndercloudHomeDir}
         admin_password: {get_param: AdminPassword}
         snmp_readonly_user_password: {get_param: SnmpdReadonlyUserPassword}
-        enable_validations: {get_param: EnableValidations}
         internal_tls_ca_file:
           if:
           - ca_file_enabled