Revert "[Tizen] Move MediaServer dbus objects to worker thread"

This reverts commit 366c5b79b1c1de0efec3b2c6a27f255b96834f9b.

BUG=XWALK-2009
Merge pull request #351 from alexshalamov/remove_dlna_worker_thread

Revert "[Tizen] Move MediaServer dbus objects to worker thread"