is-internet-working: support missing ping/whois #488

Job	Run time
fresh-macos-test	6m 30s
homebrew-macos-test	6m 31s
distro-test (ubuntu:latest)	4m 8s
login-shells-and-linting	6m 29s
distro-test (fedora:latest)	4m 9s
distro-test (debian:latest)	3m 58s
distro-test (alpine:latest)	6m 17s
distro-test (manjarolinux/base)	3m 52s
distro-test (opensuse/leap)	6m 18s
distro-test (opensuse/tumbleweed)	4m 14s
distro-test (kalilinux/kali-rolling)	4m 35s
	57m 1s

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