Addresses failure to collect iptables information if lock is held during
data capture. Follows the reccomendation of iptables stderr in this
scenario:
```
Another app is currently holding the xtables lock. Perhaps you want to
use the -w option?
```
Signed-off-by: Trapier Marshall <trapier.marshall@docker.com>
This script gathers some basic information from a system that might
be useful to help troubleshoot problems. If added into an image
including the proper binaries, running looks something like this:
docker run --rm \
-v /var/run/docker.sock:/var/run/docker.sock \
-v /var/run/docker/netns:/var/run/docker/netns \
--privileged --net=host nwsupport /bin/support
Signed-off-by: Daniel Hiltgen <daniel.hiltgen@docker.com>