autotests: add examples of numeric IPv4 host and port combinations
Some extra tests, triggered by an investigation into BUG 452978 -- none of the test cases used, say, 127.0.0.1:4000 for host+port, which is a typical jekyll local-server URL.
Some extra tests, triggered by an investigation into BUG 452978 -- none of the test cases used, say, 127.0.0.1:4000 for host+port, which is a typical jekyll local-server URL.