Add terminate function to stop server.
Add terminate function to stop server.

Only exposed in the API if opts.debug is set.

kanaka/raft.js,kanaka/fuzzy-raft,moquist/raft.js,kanaka/raft.js,tempbottle/raft.js,tempbottle/raft.js,kanaka/fuzzy-raft,moquist/raft.js,tempbottle/raft.js,kanaka/raft.js,kanaka/raft.js,moquist/raft.js,kanaka/fuzzy-raft,moquist/raft.js,kanaka/raft.js,tempbottle/raft.js,kanaka/fuzzy-raft,kanaka/fuzzy-raft,tempbottle/raft.js,moquist/raft.js