button-handler: Add ID button actions

Creates a signal handler for the 'Released' signal.

The handler will toggle the 'Asserted' property in the
LED group defined by the configure file.  The default
group is 'enclosure_identify'.  The effect of this is
the LEDs in the group will toggle on or off on each
button press.

Tested: Used the 'simPress' method on the ID button object.

Change-Id: I9f68a8b3fae02efc7f6cfb6dbcf8a45cce7f2d9c
Signed-off-by: Matt Spinler <spinler@us.ibm.com>
4 files changed