fix last unit test failed.
decouple router and bns register.
add RMI random port supported. Apps can read JPAAS_CONTAINER_RMI_<%tagname%>_RANDOM_PORT to get the random port.
update unit test.
add nil condition to avoid nil.each_pair
fix env_spec.rb bug, add :instance_mgr_host_port return.
delete unused code.
Merge pull request #55 from X-Plat/Feature/add_rmi_random_port

Feature/add rmi random port