Fix bug 1809 - Disabling RO OpenNebula plugin

Change-Id: I52a7947450d83b91fac92170348f7d474a878d97
Signed-off-by: sousaedu <eduardo.sousa@canonical.com>
diff --git a/requirements.in b/requirements.in
index df2710f..9565be2 100644
--- a/requirements.in
+++ b/requirements.in
@@ -28,8 +28,10 @@
 -r RO-VIM-aws/requirements.in
 -r RO-VIM-azure/requirements.in
 -r RO-VIM-fos/requirements.in
--r RO-VIM-opennebula/requirements.in
+#-r RO-VIM-opennebula/requirements.in
 -r RO-VIM-openstack/requirements.in
 -r RO-VIM-openvim/requirements.in
 -r RO-VIM-vmware/requirements.in
 -r RO-VIM-gcp/requirements.in
+portend<3.1.0
+pyyaml==5.4.1