tests package: now require git-daemon

Reason: https://github.com/containers/buildah/pull/3701
rewrote some tests so as to use a local git daemon. Those tests
are being skipped in bodhi right now because the git-daemon
package is not installed.

Signed-off-by: Ed Santiago <santiago@redhat.com>

buildah.spec

@@ -99,6 +99,7 @@ Requires: jq
 Requires: httpd-tools
 Requires: openssl
 Requires: nmap-ncat
+Requires: git-daemon
 
 %description tests
 %{summary}