Fix dockerfile
Fix incorrect filenames
update doc
plugin: add http_proxy
add http proxy
add http proxy add proxy code add proxy
client: add start params
Proxy names specified in 'start' params divided by ',' will be started. If it is empty or not defined, all proxies will be started.
client: add login_fail_exit params, default is true
if login_fail_exit is false, when frpc first login to server failed, it will continues relogin to server every 30 seconds.
new feature plugin and unix domian socket plugin
doc: update
change allow ports from map to array