kbfsmd: conflict error can happen when lock expires too
kbfsmd: conflict error can happen when lock expires too

Issue: KBFS-3407

keybase/client,keybase/kbfs,keybase/client,keybase/client,keybase/client,keybase/client,keybase/client,keybase/client,keybase/client,keybase/client,keybase/kbfs,keybase/client,keybase/kbfs,keybase/client,keybase/client,keybase/kbfs