Fix lint issues

[fcrisciani]

The package updated and now shows new warnings that had to be corrected
to let the CI pass

Signed-off-by: Flavio Crisciani flavio.crisciani@docker.com

[codecov-io]

Codecov Report

❗ No coverage uploaded for pull request base (master@6d09846). Click here to learn what that means.
The diff coverage is 66.66%.

@@           Coverage Diff            @@
##             master   #1947   +/-   ##
========================================
  Coverage          ?     38%           
========================================
  Files             ?     137           
  Lines             ?   27149           
  Branches          ?       0           
========================================
  Hits              ?   10317           
  Misses            ?   15562           
  Partials          ?    1270

Impacted Files	Coverage Δ
drivers/overlay/ov_endpoint.go	0% <0%> (ø)
drivers/bridge/bridge.go	53.5% <100%> (ø)
endpoint_info.go	56.37% <100%> (ø)
sandbox_dns_unix.go	45.91% <100%> (ø)
iptables/iptables.go	54.57% <100%> (ø)
drivers/bridge/setup_ip_tables.go	55.26% <50%> (ø)

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[vieux]

LGTM