api/client/client_test.go: TestNewMutualTLSServer fails with Golang 1.14beta1

[eclipseo]

Fedora Rawhide with Go 1.14beta1, cfssl 1.4.1:

--- FAIL: TestNewMutualTLSServer (0.00s)
    client_test.go:101: no error message {"code":7400,"message":"failed POST to https://nohost:8888/api/v1/cfssl/sign: Post \"https://nohost:8888/api/v1/cfssl/sign\": dial tcp: lookup nohost on [::1]:53: read udp [::1]:60785-\u003e[::1]:53: read: connection refused"}
FAIL

See golang/go@64cfe9f#diff-9667474d33400190658e4758cf28dbf5
and
golang/go#29261