Adds python tests to check that -T (disable PTY) and -t (force PTY)
arguments work as expected for `adb shell`.
Bug: http://b/23825231
Change-Id: I5343fae35b2be8459a9b95125f66def46c26adf4
This really ought to be maintained as a separate project. Also adds a
setup.py for distribution.
Bug: http://b/22881740
Change-Id: I8e11e4154fac21d3196a533613822b236b2b73e6