webos-image: nodejs-module-webos-sysbus=30

:Release Notes:
Fixed a memory-management problem in nodejs-module-webos-sysbus, which would cause occasional crashes in services, in particular Second Screen.

:Detailed Notes:
Jason Lai tracked down a crash in the sysbus module for me. The issue is that uv_poll_stop apparently doesn't actually remove the handles from the queue. There needs to be a separate uv_close after calling uv_poll_stop.
Furthermore, the handles don't get cleaned up until after the event loop runs, so it needs to be cleaned up using a close_cb callback.
This patch was made by Jason, we both tested it, ad it seems to fix the crash.

:Testing Performed:
Ran several services, especialy including starting and cancelling subscription calls, which was problematic before. No crashes were seen.

:QA Notes:
This should definitely make Second Screen more-reliable.

:Issues Addressed:
[GF-27852] Crash in node.js, possibly related to unregistering handles

Open-webOS-DCO-1.0-Signed-off-by: Mark Bessey <mark.bessey@lge.com>

Change-Id: Icdeaefee3e5d93df69276237fcaf217b34b1f54c
Reviewed-on: https://g2g.palm.com/3337
Reviewed-by: Build Verification
Reviewed-by: Susan Montooth <susan.montooth@lge.com>
Tested-by: Susan Montooth <susan.montooth@lge.com>