initialize GUID in linux target
ALLJOYN-2048 AJTCL unit tests timeout in buildbot

a. Increased the connect-to-daemon timeout (udp discovery + tcp connect)
   from 125ms to 1500ms
b. Re-enabled the BusAttachmentTest.ReleaseName in buildbot conf file
ALLJOYN-2048 AJTCL unit tests timeout in buildbot

Fix the serious warning:
warning: large integer implicitly truncated to unsigned type [-Woverflow]

The interger trucation voids the increase in timeout causing the timeout
problem to resurface.