testing: assure we run containers with network mode host

Avoids failure to install packages on docker hosts that are not
configured to enable internet access by default.

Author: ssbarnea

tests/roles/ensure-ansible/molecule/default/molecule.yml

@@ -2,34 +2,40 @@
 driver:
   name: docker
 
+# network_mode: host needed to assure internet access
 platforms:
 
   - name: centos7
     hostname: centos7
     image: centos:7
     dockerfile: ../Dockerfile.j2
+    network_mode: host
 
   - name: fedora
     hostname: fedora
     image: fedora:latest
     dockerfile: ../Dockerfile.j2
+    network_mode: host
 
   - name: rhel8
     hostname: rhel8
     image: ubi8/python-36
     registry:
       url: registry.access.redhat.com
     dockerfile: ../Dockerfile.j2
+    network_mode: host
 
   - name: ubuntu
     hostname: ubuntu
     image: ubuntu:latest
     dockerfile: ../Dockerfile.j2
+    network_mode: host
 
   - name: debian
     hostname: debian
     image: debian:latest
     dockerfile: ../Dockerfile.j2
+    network_mode: host
 
 provisioner:
   name: ansible