Commits on Oct 5, 2018

1. clientv3: concurrency.Mutex.Lock() - preserve invariant …

   Convenient invariant:
   - if werr == nil then lock is supposed to be locked at the moment.
   
   While we could not be confident in stronger invariant ('is exactly locked'),
   it were inconvenient that previous code could return `werr == nil` after
   Mutex.Unlock.
   
   It could happen when ctx is canceled/timeouted exactly after waitDeletes
   successfully returned werr == nil and before `<-ctx.Done()` checked.
   While such situation is very rare, it is still possible.
   
   fixes etcd-io#10111

   

   funny-falcon committed Oct 5, 2018
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