Add a security scanner api config object for params

Change SecScanAPI to use a uri creation func instead of test context

Pass config provider through validator context

Remove app config dependency for validators

util/config/provider/baseprovider.py

@@ -123,3 +123,8 @@ class BaseProvider(object):
   def get_volume_path(self, directory, filename):
     """ Helper for constructing relative file paths, which may differ between providers.
         For example, kubernetes can't have subfolders in configmaps """
+
+  @abstractmethod
+  def get_config_root(self):
+    """ Returns the config root directory. """
+