Add input md5 check to create_device_library_links.py

Add input md5 check to create_device_library_links.py

The md5 stamp path includes the device serial (i.e. the stamp is
library-device specific).

Also, this no longer creates a shell for-loop as the command to send to
adb. adb shell has a ~1000 character limit for commands, and the
for-loop was exceeding that limit. Now that we only create links for
libraries that actually have changed, there is not as much benefit to
creating all the links in one adb command.

BUG=158821
Committed: https://src.chromium.org/viewvc/chrome?view=rev&revision=192484

[Yaron, 2013-04-04 20:36:17]

lgtm

[commit-bot: I haz the power, 2013-04-05 00:11:02]

CQ is trying da patch. Follow status at
https://chromium-status.appspot.com/cq/cjhopman@chromium.org/13537006/1

[commit-bot: I haz the power, 2013-04-05 03:51:53]

Change committed as 192484