vendor: update all dependencies except Azure SDK

The Azure SDK doesn't support Go 1.5 anymore. We can't upgrade it until
Go 1.8 comes out.

vendor/github.com/syndtr/goleveldb/leveldb/session.go

@@ -47,6 +47,7 @@ type session struct {
 	o        *cachedOptions
 	icmp     *iComparer
 	tops     *tOps
+	fileRef  map[int64]int
 
 	manifest       *journal.Writer
 	manifestWriter storage.Writer
@@ -69,6 +70,7 @@ func newSession(stor storage.Storage, o *opt.Options) (s *session, err error) {
 	s = &session{
 		stor:     stor,
 		storLock: storLock,
+		fileRef:  make(map[int64]int),
 	}
 	s.setOptions(o)
 	s.tops = newTableOps(s)