Skip Patrole test_show_auto_allocated_topology

Skip Patrole test_show_auto_allocated_topology

test_show_auto_allocated_topology doesn't clean its resources:
- network: auto_allocated_network
- subnets: auto_allocated_subnet_v4 & auto_allocated_subnet_v6
- router: auto_allocated_router

This bug easily breaks testing in a quick run when allocating the
subnet due to insufficient prefix space to allocate subnet size /26.

https://build.opnfv.org/ci/job/functest-latest-daily/746/

Change-Id: I1a1bd22068bca0720016dab8a15ad7dd576ee152
Signed-off-by: Cédric Ollivier <cedric.ollivier@orange.com>