Create network-isolation-no-tunneling.yaml using jinja2

Create network-isolation-no-tunneling.yaml using jinja2

The existing network-isolation-no-tunneling.yaml contains
references to missing files. This patch generates the file
with jinja to include custom networks and make it work
with composable networks.

Closes-Bug: #1718797
Change-Id: Ibcab2f6b5ac880a6b3d7dd5126bd24facfa17322
Signed-off-by: Antoni Segura Puimedon <antonisp@celebdor.com>
Co-authored-by: Dan Sneddon <dsneddon@redhat.com>
(cherry picked from commit 47185342bdd247a2e2735ef96c777ecec663086d)