Corrected metadata.json

There were two references to stdlib in the metadata.json file.
Similarly, there is a dependency on a module that cannot be directly
installed via 'puppet module install' (openstackci/httpd), so I am
switching our metadata back in line with the Modulefile until
that changes.

Change-Id: I04636b14f9cb7b945156a7f20c5321b54ffa67be

metadata.json

@@ -17,7 +17,7 @@
       "version_requirement": ">= 0.6.1"
     },
     {
-      "name": "openstackci/httpd",
+      "name": "puppetlabs/apache",
       "version_requirement": "= 0.0.4"
     },
     {
@@ -35,10 +35,6 @@
     {
       "name": "stankevich/python",
       "version_requirement": ">= 1.6.6"
-    },
-    {
-      "name": "puppetlabs/stdlib",
-      "version_requirement": ">= 3.2.0"
     }
   ]
 }