vmcheck: Drop hack for updating ostree

The version in the current release has the fix.

Closes: #698
Approved by: jlebon

tests/vmcheck/overlay.sh

@@ -62,19 +62,8 @@ ostree checkout $commit vmcheck --fsync=0
 # ✀✀✀ BEGIN hack for https://github.com/projectatomic/rpm-ostree/pull/693 ✀✀✀
 rm -f vmcheck/usr/etc/{.pwd.lock,passwd-,group-,shadow-,gshadow-,subuid-,subgid-}
 # ✀✀✀ END hack for https://github.com/projectatomic/rpm-ostree/pull/693 ✀✀✀
+# Now, overlay our built binaries
 rsync -rlv /var/roothome/sync/insttree/usr/ vmcheck/usr/
-# ✀✀✀ BEGIN hack for https://github.com/projectatomic/rpm-ostree/pull/642 ✀✀✀
-ostree admin unlock || true
-for url in https://kojipkgs.fedoraproject.org//packages/ostree/2017.2/3.fc25/x86_64/ostree-{,libs-,grub2-}2017.2-3.fc25.x86_64.rpm; do
-    curl -sSL -O $url
-done
-rpm -Uvh --force *.rpm
-for x in *.rpm; do
-    rpm2cpio $x | (cd vmcheck && cpio -div)
-done
-rm vmcheck/etc -rf
-rm -f *.rpm
-# ✀✀✀ END hack for https://github.com/projectatomic/rpm-ostree/pull/642 ✀✀✀
 ostree refs --delete vmcheck || true
 ostree commit -b vmcheck -s '' --tree=dir=vmcheck --link-checkout-speedup
 ostree admin deploy vmcheck