add plugins/sslpath setting, default to site path/plugins

README

@@ -1588,6 +1588,7 @@ sslserver: Server to find static files for a plugin when the page is HTTPS. Defa
 path: Path to the plugin files. defaults to site/path + '/plugins/'. Expects that
       each plugin will have a subdirectory at plugins/NameOfPlugin. Change this
       if you're using a CDN.
+sslpath: Path to use on the SSL server. Same as plugins/path.
 
 Plugins
 =======

lib/default.php

@@ -317,6 +317,7 @@ $default =
               'server' => null,
               'sslserver' => null,
               'path' => null,
+              'sslpath' => null,
               ),
         'admin' =>
         array('panels' => array('design', 'site', 'user', 'paths', 'access', 'sessions', 'sitenotice', 'license')),

lib/plugin.php

@@ -152,7 +152,11 @@ class Plugin
             }
         }
 
-        $path = common_config('plugins', 'path');
+        if ($isHTTPS) {
+            $path = common_config('plugins', 'sslpath');
+        } else {
+            $path = common_config('plugins', 'path');
+        }
 
         if (empty($path)) {
             $path = common_config('site', 'path') . '/plugins/';