Change master postgres log directory to /var/log

As long as postgres has many options and main postgresql module
cannot cover them all, write small new type that can optionally
change any postgresql option similar to existing OpenStack config
types based on ini_setting

Change-Id: I3066bccec7b5ba8f3e9d377d61e716196210cdb7
Closes-Bug: #1458545

deployment/puppet/nailgun/examples/postgres-only.pp

@@ -52,3 +52,12 @@ postgresql::server::db { $ostf_dbname:
   grant    => 'all',
   require => Class['::postgresql::server'],
 }
+
+Class['postgresql::server'] -> Postgres_config<||>
+Postgres_config { ensure => present }
+postgres_config {
+  log_directory     : value => "'/var/log/'";
+  log_filename      : value => "'pgsql'";
+  log_rotation_age  : value => "7d";
+}
+

deployment/puppet/nailgun/lib/puppet/provider/postgres_config/ini_setting.rb

@@ -0,0 +1,22 @@
+Puppet::Type.type(:postgres_config).provide(
+  :ini_setting,
+  :parent => Puppet::Type.type(:ini_setting).provider(:ruby)
+) do
+
+  def section
+    ""
+  end
+
+  def setting
+    resource[:name]
+  end
+
+  def separator
+    '='
+  end
+
+  def file_path
+    '/var/lib/pgsql/9.3/data/postgresql.conf'
+  end
+
+end

deployment/puppet/nailgun/lib/puppet/type/postgres_config.rb

@@ -0,0 +1,19 @@
+Puppet::Type.newtype(:postgres_config) do
+
+  ensurable
+
+  newparam(:name, :namevar => true) do
+    desc 'Section/setting name to manage from postgres.conf'
+    newvalues(/\S+/)
+  end
+
+  newproperty(:value) do
+    desc 'The value of the setting to be defined.'
+    munge do |value|
+      value = value.to_s.strip
+      value.capitalize! if value =~ /^(true|false)$/i
+      value
+    end
+  end
+
+end