Crash during dgraph test

[ashwin95r]

Saw these logs on Dgraph Travis. Not reproducible though. Just wanted to bring it to notice.

TESTING: github.com/dgraph-io/dgraph/gql
2017/06/07 12:10:37 error.go:45: EOF
Unable to replay value log: "/tmp/000000.vlog"
github.com/dgraph-io/badger/badger.(*valueLog).Replay
	/home/travis/gopath/src/github.com/dgraph-io/badger/badger/value.go:574
github.com/dgraph-io/badger/badger.NewKV
	/home/travis/gopath/src/github.com/dgraph-io/badger/badger/kv.go:226
github.com/dgraph-io/dgraph/gql.TestMain
	/home/travis/gopath/src/github.com/dgraph-io/dgraph/gql/parser_test.go:3359
main.main
	github.com/dgraph-io/dgraph/gql/_test/_testmain.go:520
runtime.main
	/home/travis/.gimme/versions/go1.8.linux.amd64/src/runtime/proc.go:185
runtime.goexit
	/home/travis/.gimme/versions/go1.8.linux.amd64/src/runtime/asm_amd64.s:2197
exit status 1
FAIL	github.com/dgraph-io/dgraph/gql	0.021s

[manishrjain]

This has been fixed. The problem was the value dir wasn't being set (after a recent change which required explicitly setting value dir).