Fix some wrong implementations.

Fix some wrong implementations.

 - wl_egl_surface->need_to_enqueue should be
  initialized to TPL_TRUE at first time.
 - If release_fence, which is from tpl_surface_dequeue,
  is not null and surface_sync is not used,
   it should be initialized to -1.
 - _thread_wl_surface_commit should be called only if
  there is a buffer in vblank_waiting_buffers
  when vblank event occurs.
 - Some debug logs were added.

Change-Id: I8dc72c5b0ddbb0d38e149d809191620691caf698
Signed-off-by: Joonbum Ko <joonbum.ko@samsung.com>