Fix check_ip argument when gitlab-sshd used with PROXY protocol
When gitlab-sshd were used with the PROXY protocol, the check_ip
argument passed to /api/v4/internal/allowed was the Go remote
address, which is a host and port combination
(e.g. 127.0.0.1:12345). As a result, This prevents IP restrictions
from working properly on Rails. We fix this by stripping out the port
if it is present.
When OpenSSH is used, this is not an issue because the IP address
is extracted from SSH_CONNECTION.
Edited by Stan Hu