Add password visibility toggle

This commit will add a new password visibility toggle directive.
The new directive was added to the local user management,
user modal password input fields.

Signed-off-by: Yoshie Muranaka <yoshiemuranaka@gmail.com>
Change-Id: I4e2baf53eec04aaff1bba26948779de6e447e3e7
diff --git a/app/index.js b/app/index.js
index 5525aef..32acb66 100644
--- a/app/index.js
+++ b/app/index.js
@@ -63,6 +63,7 @@
 import form_input_error from './common/directives/form-input-error.js';
 import icon_provider from './common/directives/icon-provider.js';
 import password_confirmation from './common/directives/password-confirmation.js';
+import password_visibility_toggle from './common/directives/password-visibility-toggle/password-visibility-toggle.js';
 
 import components_index from './common/components/index.js';
 import table_component from './common/components/table/table.js';