As it was before: when the database was opened, an error returned,
but along with the original error, the `context cancelled`` error returned,
because `iterateIncompletedRebuildDBPaths` method has `ctx.Done()` check
and egCtx passed to `iterateIncompletedRebuildDBPaths` method.
Signed-off-by: Dmitrii Stepanov <d.stepanov@yadro.com>
