Switch any gen_server2 modules to regular gen_server

[Vagabond]

We use an ancient gen_server2 that lacks any of the improvements added to gen_server2 or to the OTP gen_server. Dump it and use the regular gen_server.

[jonmeredith]

By gen_server2, do you mean riak_core_gen_server used here

deps/riak_core/src/riak_core_gen_server.erl
deps/riak_core/src/riak_core_handoff_listener.erl
deps/riak_core/src/riak_core_handoff_receiver.erl
deps/riak_core/src/riak_core_handoff_sender.erl
deps/riak_repl/src/riak_repl_fullsync_helper.erl
deps/riak_repl/src/riak_repl_keylist_server.erl

I can't see references to gen_server2 anywhere.

[Vagabond]

yes.