deps: YAML module for python3
For the RHCOS use case, we need the `yaml` module for Python.
Installing it via SCL appears to be the most straightforward way to
do so.
@@ -28,7 +28,7 @@ libvirt libguestfs-tools qemu-kvm /usr/bin/qemu-img /usr/bin/virsh /usr/bin/virt
/usr/bin/ksflatten
# scl and python36 For EL7
-#EL7 scl-utils rh-python36
+#EL7 scl-utils rh-python36 rh-python36-PyYAML
# ostree-releng-scripts dependencies
rsync
