Merge branch 'ssrf-protections-round-2-10-0' into 'security-10-0'

Replace SSRF resolver with Addrinfo.getaddrinfo to include alternative localhost versions (10-0)

See merge request gitlab/gitlabhq!2220

(cherry picked from commit be1198563d39779e002530e070a3e18cfeacacaa)

0e21fb35 Replace SSRF resolver with Addrinfo.getaddrinfo to include alternative localhost versions