Implement the URL-sanity test. 🔼

This tests puts some gratuitous multiple slashes in the URL, to check the mirror can deal with that.  The example is -

curl -s -L --header "Host: deb.devuan.org" http://${mbase}/merged///${SANITYURI}

reported=2019-06-25 03:24:03

reporter=onefang

priority=high

category=TODO

severity=feature