kv,storage,sql: purge snapshot isolation

Snapshot isolation was disabled in v2.1, so it is safe to remove all code paths that handle snapshot isolation in v2.2. Note that the change to the MVCCMetadata checksum in pkg/storage/below_raft_protos_test.go is safe, because the actual encoding of the protobuf is not affected by this change. What is affected is NewPopulatedMVCCMetadata, which no longer returns a TxnMeta with a non-zero IsolationType, since the IsolationType field has been removed. This is a necessary precursor to cockroachdb#32487. Release note: None
nvanbenschoten · Dec 6, 2018 · 39ba88b · 39ba88b
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diff --git a/c-deps/libroach/protos/roachpb/data.pb.cc b/c-deps/libroach/protos/roachpb/data.pb.cc
diff --git a/c-deps/libroach/protos/roachpb/data.pb.h b/c-deps/libroach/protos/roachpb/data.pb.h
diff --git a/c-deps/libroach/protos/storage/engine/enginepb/mvcc3.pb.cc b/c-deps/libroach/protos/storage/engine/enginepb/mvcc3.pb.cc
diff --git a/c-deps/libroach/protos/storage/engine/enginepb/mvcc3.pb.h b/c-deps/libroach/protos/storage/engine/enginepb/mvcc3.pb.h