feat(FQDN): Replace rpc_address to host_prot for function & Add host_port on thrift struct

[GehaFearless]

issue: https://github.com/apache/incubator-pegasus/issues/1659

1.Replace type rpc_address to host_port on class variables. Modify the parameter types of the function if necessary.

2.Add type 'host_port' member to thrift struct which have 'rpc_address'.

[acelyc111]

Some changes can be separated to another patch, for example, the changes in:

1. src/common/json_helper.h and its tests.
2. src/runtime/rpc/rpc_host_port.h (add some tests as well)

[acelyc111]

TODO (in next patches):

• [x] Just pass host_post parameter, don't pass rpc_address parameters for generate_balancer_request and new_proposal_action
• [x] Change the -r parameter to resolve hostname to IP in Cpp-shell.
• [x] Use hostname for backup in get_remote_chkpt_dirname()