We shipped (well, are about to ship) an adbd that spuriously fails to
create directories upon push. Work around this in the adb client by
running a mkdir on all of the directories we would have otherwise
created.
On devices where we perform the workaround, this coincidentally fixes
a historic bug where we failed to push empty directories.
Bug: http://b/25566053
Bug: http://b/110953234
Test: python test_device.py
Change-Id: I690ec356c206fed4e5ab2c681c5570c8b231e26b
0cee7ccc59