add ability to create service_provider level apikeys

lib/models/api-key.js

@@ -27,6 +27,25 @@ class ApiKey extends Model {
     });
   }
 
+  /**
+  * list all api keys for a service provider
+  */
+  static retrieveAllForSP(service_provider_sid) {
+    const sql = 'SELECT * from api_keys WHERE service_provider_sid = ?';
+    const args = [service_provider_sid];
+
+    return new Promise((resolve, reject) => {
+      getMysqlConnection((err, conn) => {
+        if (err) return reject(err);
+        conn.query(sql, args, (err, results) => {
+          conn.release();
+          if (err) return reject(err);
+          resolve(results);
+        });
+      });
+    });
+  }
+
   /**
   * update last_used api key for an account
   */