Use automatic lookups for fpm class variables

Puppet documentation states `unique` ("array merge") behavior
will return a merged array and will fail for hashes. We can
instead rework this lookup function to automatically lookup
the variables as per current best practises.

This change is in line with b188888.

Closes voxpupuli#536.

data/default.yaml

@@ -1,5 +1,5 @@
 ---
-php::fpm_pools:
+php::fpm::pools:
   www:
     catch_workers_output: 'no'
     listen: '127.0.0.1:9000'

manifests/fpm.pp

@@ -70,7 +70,7 @@
     warning('php::fpm is private')
   }
 
-  $real_settings = lookup('php::fpm::settings', Hash, {'strategy' => 'deep', 'merge_hash_arrays' => true}, $settings)
+  $real_settings = $settings
 
   # On FreeBSD fpm is not a separate package, but included in the 'php' package.
   # Implies that the option SET+=FPM was set when building the port.
@@ -99,8 +99,8 @@
 
   Class['php::fpm::config'] ~> Class['php::fpm::service']
 
-  $real_global_pool_settings = lookup('php::fpm::global_pool_settings', Hash, {'strategy' => 'unique'}, $global_pool_settings)
-  $real_pools = lookup('php::fpm::pools', Hash, {'strategy' => 'unique'}, $pools)
+  $real_global_pool_settings = $global_pool_settings
+  $real_pools = $pools
   create_resources(::php::fpm::pool, $real_pools, $real_global_pool_settings)
 
   # Create an override to use a reload signal as trusty and utopic's