podman upgrade tests

Initial validation of using podman-in-podman to create an
old-podman root, then use new-podman to play with the
containers created therein.

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

contrib/cirrus/runner.sh

@@ -70,6 +70,10 @@ function _run_sys() {
     dotest system
 }
 
+function _run_upgrade_test() {
+    bats test/upgrade |& logformatter
+}
+
 function _run_bindings() {
     # shellcheck disable=SC2155
     export PATH=$PATH:$GOSRC/hack

contrib/cirrus/setup_environment.sh

@@ -200,6 +200,7 @@ case "$TEST_FLAVOR" in
     compose) ;&
     int) ;&
     sys) ;&
+    upgrade_test) ;&
     bindings) ;&
     endpoint)
         # Use existing host bits when testing is to happen inside a container