tests: test_urls: Update

* latest SL is detected as centos again
* ubuntu URLs have moved, bump them forward

Signed-off-by: Cole Robinson <crobinso@redhat.com>

tests/data/test_urls.ini

@@ -66,7 +66,7 @@ distro = scientificlinux6.10
 # Latest scientific 7, detected as centos
 [centos-sl7-latest]
 url = http://ftp.scientificlinux.org/linux/scientific/7/x86_64/os
-distro = scientificlinux7.6
+distro = centos7.0
 
 # centos7 with exotic archs (i686 is dead)
 [centos-7-latest]
@@ -173,15 +173,10 @@ url = http://old-releases.ubuntu.com:80/ubuntu/dists/hardy/main/installer-i386
 distro = ubuntu8.04
 testshortcircuit = 1
 
-# Latest LTS
-[ubuntu16.04]
-url = http://us.archive.ubuntu.com/ubuntu/dists/xenial/main/installer-amd64
-distro = ubuntu16.04
-# Check for xen for full coverage
-[ubuntu19.04]
-url = http://us.archive.ubuntu.com/ubuntu/dists/disco/main/installer-amd64
-testxen = 1
-distro = ubuntu19.04
+# Older LTS
+[ubuntu18.04]
+url = http://us.archive.ubuntu.com/ubuntu/dists/bionic/main/installer-amd64
+distro = ubuntu18.04
 # Latest release.
 # Check for legacy-images for full coverage
 [ubuntu20.04]