spec:test node: fix jruby run(fork replacement)

Conflicts:
	spec/test_node.rb
spec: skip node relocation for jruby for now
heartbeat: ignore messages from self
node: issue delayed partition event only from connected state
spec:test helper: run dcell server only when test actor is attached
node: gracefully log unexpected exceptions during node relocation
registries:cassandra: refresh API
registries:cassandra: driver expects IP, not hostname
travis: create cassandra schema