They connect to the same endpoints, the only difference is that
connection for synchronization is limited in lifetime and is closed
after the sync is finished. This is probably not intentional, as
synchronization was implemented before cache was introduced.
However, reusing dialTreeService() in sync.go has possible perfomance
implications, so is avoided for now.
Change-Id: I2e37befd783b4d873ff833969f932deded1195be
Signed-off-by: Evgenii Stratonikov <e.stratonikov@yadro.com>