appium: Android emulator does not quit automatically

The problem

When running Selenium tests on an Android virtual device, the device does not power off after the test ends, and the emulator does not quit.

Environment

• Appium version (or git revision) that exhibits the issue: 1.6.3
• Last Appium version that did not exhibit the issue (if applicable):
• Desktop OS/version used to run Appium: macOS 10.12.2
• Node.js version (unless using Appium.app|exe): 7.1.0
• Mobile platform/version under test: Android 5.1.1, 6.0, 7.1.1
• Real device or emulator/simulator: Emulator
• Appium CLI or Appium.app|exe: Appium CLI

Details

I have a basic Python script that runs a simple test with Selenium and Appium in a web browser.

The test runs all right but afterwards, the emulator itself never quits. I expected that it would behave like the iOS simulator.

Since the emulator does not quit automatically, I can also not conveniently run tests on another virtual device on the same host machine (attempting to do so can lead Appium to crash).

Link to Appium logs

https://gist.github.com/SteffenL/2f01cad53d43bf5ec34a54e00c386aaf

Code To Reproduce Issue [ Good To Have ]

Sample code: sample-code/examples/python/android_simple.py

A simpler example:

from selenium import webdriver

cap = {"browserName": "Browser", "platformName": "Android", "deviceName": "Android Emulator", "platformVersion": "5.1.1", "automationName": "Appium", "avd": "Nexus_5_5.1.1"}
driver = webdriver.Remote("http://localhost:4723/wd/hub", cap)
driver.get("http://www.seleniumhq.org/")
driver.quit()