optimize regular expression for postgres config parsing

Signed-off-by: Christoph Hartmann <chris@lollyrock.com>

lib/resources/postgres_conf.rb

@@ -74,7 +74,10 @@ module Inspec::Resources
         raw_conf = read_file(to_read[0])
         @content += raw_conf
 
-        params = SimpleConfig.new(raw_conf).params
+        opts = {
+          assignment_re: /^\s*([^=]*?)\s*=\s*[']?\s*(.*?)\s*[']?\s*$/,
+        }
+        params = SimpleConfig.new(raw_conf, opts).params
         @params.merge!(params)
 
         to_read = to_read.drop(1)

test/helper.rb

@@ -128,6 +128,7 @@ class MockLoader
       '/etc/xinetd.d/chargen-stream' => mockfile.call('xinetd.d_chargen-stream'),
       '/etc/xinetd.d/chargen-dgram' => mockfile.call('xinetd.d_chargen-dgram'),
       '/etc/sysctl.conf' => mockfile.call('sysctl.conf'),
+      '/etc/postgresql/9.4/main/postgresql.conf' => mockfile.call('postgresql.conf'),
     }
 
     # create all mock commands

test/unit/mock/files/postgresql.conf

@@ -0,0 +1,7 @@
+# PostgreSQL configuration file
+data_directory = '/var/lib/postgresql/9.4/main'
+datestyle = 'iso, mdy'
+log_connections = on
+doublequote = ''value''
+empty =
+key