add mobile: endpoints methods to support multiple apps

[KazuCocoa]

This is a

• Bug report
• Question
• Freature Request

Summary

https://github.com/appium/appium-xcuitest-driver/pull/576/files

Environment

• Appium version (or git revision):
• ruby_lib version:
• Mobile platform/version/device under test:

Actual behaviour and steps to reproduce

Expected behaviour

Link to Appium/Ruby logs

Create a GIST which is a paste of your full Appium logs, and link them here.

Any additional comments

[mykola-mokhnach]

Plus appium/appium-xcuitest-driver#584