Add check for IP overlap in support.sh
Add check for IP overlap in support.sh

Add a simple check and a summary report for the support script.

Report:
==SUMMARY==
         Processed 3 networks
         IP overlap found: 1
         Processed 167 containers

Overlap found:
*** OVERLAP on Network 0ewr5iqraa8zv9l4qskp93wxo ***
      2  "192.168.1.138",

Signed-off-by: Flavio Crisciani <59eae1aa696b1b39cd87a38bdba3f0b2630647f9@docker.com>

medallia/libnetwork,mahak/libnetwork,abhi/libnetwork,docker/libnetwork,docker/libnetwork,vdemeester/libnetwork,mahak/libnetwork,mahak/libnetwork,kolyshkin/libnetwork,kolyshkin/libnetwork,medallia/libnetwork,docker/libnetwork,abhi/libnetwork,kolyshkin/libnetwork,vdemeester/libnetwork,abhi/libnetwork,medallia/libnetwork,vdemeester/libnetwork