net: ccwgroup: smooth up/down process

We need to bring the link up ourselves after we've properly configured
the device.  The common code tries to bring the link up itself, but it
does so before things are configured, and so it ends up failing.

When shutting down, we need to wait for the kernel to finish destroying
the interface.  Otherwise, when doing a restart, openrc is quick enough
to tell the kernel to destroy things, but then start trying to bring it
back up before the kernel has finished.

X-Gentoo-Bug: 367467
X-Gentoo-Bug-URL: http://bugs.gentoo.org/367467
Signed-off-by: Mike Frysinger <vapier@gentoo.org>

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