Provide a hook to change remote domain

Problem/Motivation

There might be needs to use different endpoint for specific case.
For example, while developing, several branches are used for various environment, and it is annoying to change remote URL every time for each environment.

Steps to reproduce

Proposed resolution

Provide new hook where developers can change the endpoint URL.

hook_content_remote_options_endpoint_alter() is available.

Usage:

function yourmodule_online_base_content_remote_options__options_alter (&$variables, $context) {
  // TO DO
}

Remaining tasks

User interface changes

API changes

Data model changes