Use validate_legacy

This changes all the puppet 3 validate_* functions
to use the validate_legacy function.

The validate_legacy function has been available since
about three years but require Puppet >= 4.4.0 and since
there is Puppet 4.10.12 as latest we should assume people
are running a fairly new Puppet 4 version.

This is the first step to then remove all validate function
calls and use proper types for parameter as described in spec [1].

[1] https://review.openstack.org/#/c/568929/

Change-Id: If25820ad85e763246d90954a80db86763ed9e9c5

manifests/config.pp

@@ -26,7 +26,7 @@ class tacker::config (
 
   include ::tacker::deps
 
-  validate_hash($tacker_config)
+  validate_legacy(Hash, 'validate_hash', $tacker_config)
 
   create_resources('tacker_config', $tacker_config)
 }

manifests/db.pp

@@ -56,8 +56,8 @@ class tacker::db (
 
   include ::tacker::deps
 
-  validate_re($database_connection,
-    '^(sqlite|mysql(\+pymysql)?|postgresql):\/\/(\S+:\S+@\S+\/\S+)?')
+  validate_legacy(Oslo::Dbconn, 'validate_re', $database_connection,
+    ['^(sqlite|mysql(\+pymysql)?|postgresql):\/\/(\S+:\S+@\S+\/\S+)?'])
 
   oslo::db { 'tacker_config':
     db_max_retries => $database_db_max_retries,

manifests/db/mysql.pp

@@ -45,7 +45,7 @@ class tacker::db::mysql(
 
   include ::tacker::deps
 
-  validate_string($password)
+  validate_legacy(String, 'validate_string', $password)
 
   ::openstacklib::db::mysql { 'tacker':
     user          => $user,

manifests/policy.pp

@@ -31,7 +31,7 @@ class tacker::policy (
   include ::tacker::deps
   include ::tacker::params
 
-  validate_hash($policies)
+  validate_legacy(Hash, 'validate_hash', $policies)
 
   Openstacklib::Policy::Base {
     file_path  => $policy_path,