watchdog: split out commands

I split out the watchdog command handlers into their own
subordinate file from the apphandler.  This reduces the
size of the contents of the apphandler file, and logically
cuts out code into its own files.

Change-Id: Idc70acad6c93c12456cc7092786715643c9c1ffb
Signed-off-by: Patrick Venture <venture@google.com>
4 files changed