net: fix TestInterfaceMulticastAddrs for AIX
net: fix TestInterfaceMulticastAddrs for AIX

This commit disables checkMulticastStats for AIX operating system.

Change-Id: If8d0fb609a0dcf75b7bb5c3871cfb6fad76a0a92
Reviewed-on: https://go-review.googlesource.com/c/144102
Run-TryBot: Ian Lance Taylor <87e9c6d529889242b7e184afb632328636553ab4@golang.org>
TryBot-Result: Gobot Gobot <66cb808b70d30c07676d5e946fee83fd561249e5@golang.org>
Reviewed-by: Ian Lance Taylor <87e9c6d529889242b7e184afb632328636553ab4@golang.org>

cloudflare/go,CAFxX/go,cloudflare/go,nawawi/go,nawawi/go,nawawi/go,golang/go,golang/go,CAFxX/go,akutz/go,akutz/go,josharian/go,akutz/go,cloudflare/go,nawawi/go,josharian/go,CAFxX/go,golang/go,CAFxX/go,golang/go,CAFxX/go,nawawi/go,akutz/go,nawawi/go,CAFxX/go,josharian/go,akutz/go,josharian/go,golang/go,nawawi/go,nawawi/go,cloudflare/go,golang/go,CAFxX/go,josharian/go,cloudflare/go,akutz/go,cloudflare/go,golang/go,josharian/go,golang/go,josharian/go,josharian/go,akutz/go,cloudflare/go,akutz/go,CAFxX/go,cloudflare/go