Fix listen-port help message
Convert underscore to hyphen in commands
Add commands, allow-root, buffer-send, buffer-size, host-metadata, host-metadata-item, hostname-item, listen-ip, max-lines-per-second, refresh-active-checks, start-agents and timeout
Merge pull request #2 from higebu/fix-listen-port-help-message

Fix listen-port help message
Merge branch 'underscore-to-hyphen' of https://github.com/higebu/vyos-cfg-zabbix-agent into higebu-underscore-to-hyphen
Merge branch 'higebu-underscore-to-hyphen'
Merge branch 'add-commands' of https://github.com/higebu/vyos-cfg-zabbix-agent into higebu-add-commands

Conflicts:
	README.md
Merge branch 'higebu-add-commands'
Add developer section