Merge branch '181-authorized-keys-check-go' into 'master'

go/internal/command/authorizedkeys/authorized_keys.go

go/internal/command/authorizedkeys/authorized_keys_test.go

go/internal/command/command.go

go/internal/command/command_test.go

go/internal/command/commandargs/authorized_keys.go

go/internal/command/commandargs/command_args.go

go/internal/command/commandargs/command_args_test.go

go/internal/executable/executable.go

go/internal/gitlabnet/authorizedkeys/client.go

go/internal/gitlabnet/authorizedkeys/client_test.go

go/internal/keyline/key_line.go

go/internal/keyline/key_line_test.go

spec/gitlab_shell_authorized_keys_check_spec.rb