pmlogdaemon: Install LS2 role files

:Release Notes:
PmLogDaemon now installs its luna-service2 role files.

:Detailed Notes:
The recipe was missing an "inherit webos_system_bus" command, thus the
system bus files were not being installed. This mean that the LS2 API
for the daemon was not available.

From the console log of the most recent build:

WARNING: QA Issue: pmlogdaemon: Files/directories were installed but not shipped
  /usr/share/dbus-1
  /usr/share/ls2
  /usr/share/dbus-1/system-services
  /usr/share/dbus-1/system-services/com.webos.pmlogd.service
  /usr/share/ls2/roles
  /usr/share/ls2/roles/prv
  /usr/share/ls2/roles/prv/com.webos.pmlogd.json

Meta data change only. No CCC required.

:Testing Performed:
- Examine the console log and workspace for the verification build
  to ensure the files are now installed.
- Use luna-send to send a "status" message to the daemon

:QA Notes:

:Issues Addressed:
[GF-33829] Add LS2 security file for PmLogDaemon

Open-webOS-DCO-1.0-Signed-off-by: Keith Derrick <keith.derrick@lge.com>

Change-Id: If66160af9e336838b7a4587771e07a7f74323354
Reviewed-on: https://g2g.palm.com/3218
Reviewed-by: Keith Derrick <keith.derrick@lge.com>
Tested-by: Keith Derrick <keith.derrick@lge.com>
Reviewed-by: Build Verification
Reviewed-by: Anatolii Sakhnik <anatolii.sakhnik@lge.com>
Reviewed-by: Martin Jansa <Martin.Jansa@lge.com>