The reactor is inherently single-threaded, hence there is no point
in guarding this single field. Remove synchronization and add a few
markes for future improvement.
JIRA: YANGTOOLS-1218
Change-Id: Ic5017bb589ae5086bf8310995d7c03c80e12678a Signed-off-by: Robert Varga <robert.varga@pantheon.tech>
(cherry picked from commit 0735f709c996762a2ac65338459c465bffc4dbcf)