Allow eq with term index

contrib/nightly/build.sh

dgraph/cmd/bulk/count_index.go

dgraph/cmd/bulk/reduce.go

dgraph/cmd/bulk/schema.go

posting/index_test.go

posting/list.go

posting/lists.go

posting/mvcc.go

query/query_test.go

raftwal/wal.go

vendor/github.com/dgraph-io/badger/README.md

vendor/github.com/dgraph-io/badger/backup.go

vendor/github.com/dgraph-io/badger/db.go

vendor/github.com/dgraph-io/badger/errors.go

vendor/github.com/dgraph-io/badger/iterator.go

vendor/github.com/dgraph-io/badger/levels.go

vendor/github.com/dgraph-io/badger/manifest.go

vendor/github.com/dgraph-io/badger/options.go

vendor/github.com/dgraph-io/badger/protos/backup.pb.go

vendor/github.com/dgraph-io/badger/protos/backup.proto