test: update check-source
test: update check-source

The repo url in check-source's testBasic was broken. This has now been
replaced by a fedora 30 mirrorlist which should maintain more
reliability. Additionally the packages check is removed from this test.
Packages are checked in the check-package test.

jkozol/welder-web,jkozol/welder-web,jkozol/welder-web,jkozol/welder-web