namespaces: mark NET_NS with "depends on NAMESPACES"
namespaces: mark NET_NS with "depends on NAMESPACES"

There's already an option controlling the net namespaces cloning code, so make
it work the same way as all the other namespaces' options.

Signed-off-by: Pavel Emelyanov <c9a32589e048e044184536f7ac71ef92fe82df3e@openvz.org>
Cc: "David S. Miller" <fe08d3c717adf2ae63592e4c9aec6e3e404d8e3e@davemloft.net>
Acked-by: Serge Hallyn <dd6cacb2d07f0aa354aa6e74c149a3580e5a1db1@us.ibm.com>
Cc: Cedric Le Goater <2d8cace2254d4e43578d21933db015d84bcc468a@fr.ibm.com>
Cc: "Eric W. Biederman" <8a741aa8cbd77ebc4a56ddb528ce9fd15d42f034@xmission.com>
Cc: Herbert Poetzl <ef65de1c7be0aa837fe7b25ba9a7739905af6a55@13thfloor.at>
Cc: Kirill Korotaev <34c6fceca75e456f25e7e99531e2425c6c1de443@sw.ru>
Cc: Sukadev Bhattiprolu <2ac48ee9b8f6042694a5d86ef56b8e10fe5327d1@us.ibm.com>
Signed-off-by: Andrew Morton <5c1e68b099950c134891f0b6e179498a8ebe9cf9@linux-foundation.org>
Signed-off-by: Linus Torvalds <69652caca27c8b940640ad396ab71f93cacec34f@linux-foundation.org>

KristFoundation/Programs,TeamVee-Kanas/android_kernel_samsung_kanas,TeamVee-Kanas/android_kernel_samsung_kanas,KristFoundation/Programs,KristFoundation/Programs,TeamVee-Kanas/android_kernel_samsung_kanas,KristFoundation/Programs,TeamVee-Kanas/android_kernel_samsung_kanas,KristFoundation/Programs,TeamVee-Kanas/android_kernel_samsung_kanas,KristFoundation/Programs