Remove Lock/Unlock methods from rwContainerStore
Remove Lock/Unlock methods from rwContainerStore

They are now only used in the constructor, so use a variant
of startWriting instead.  This code path is not performance-critical,
so let's share as much code as possible to ensure consistency
in locking.

Should not change behavior.

Signed-off-by: Miloslav Trmač <9c008e38982a5397deb855345fb164f0558459ae@redhat.com>

containers/storage,containers/storage,containers/storage