Run db setup by the service user instead of root

... because the command doesn't require root privilege. This follows
the guidance in current installation guide[1][2].

[1] https://docs.openstack.org/designate/latest/install/install-rdo.html
[2] https://docs.openstack.org/designate/latest/install/install-ubuntu.html

Change-Id: If664267a805edb5f7262274b0dc5b152d514c629

manifests/db/sync.pp

@@ -20,11 +20,12 @@ class designate::db::sync(
 ) {
 
   include designate::deps
+  include designate::params
 
   exec { 'designate-dbsync':
     command     => "designate-manage ${extra_params} database sync",
     path        => '/usr/bin',
-    user        => 'root',
+    user        => $::designate::params::user,
     refreshonly => true,
     try_sleep   => 5,
     tries       => 10,

spec/classes/designate_db_sync_spec.rb

@@ -14,7 +14,7 @@ describe 'designate::db::sync' do
         is_expected.to contain_exec('designate-dbsync').with(
           :command     => 'designate-manage  database sync',
           :path        => '/usr/bin',
-          :user        => 'root',
+          :user        => 'designate',
           :refreshonly => 'true',
           :try_sleep   => 5,
           :tries       => 10,
@@ -40,7 +40,7 @@ describe 'designate::db::sync' do
         is_expected.to contain_exec('designate-dbsync').with(
           :command     => 'designate-manage --config-file /etc/designate/designate.conf database sync',
           :path        => '/usr/bin',
-          :user        => 'root',
+          :user        => 'designate',
           :refreshonly => 'true',
           :try_sleep   => 5,
           :tries       => 10,