UBUNTU: SAUCE: (no-up) elide some ioctl warnings which are known benign

UBUNTU: SAUCE: (no-up) elide some ioctl warnings which are known benign

BugLink: http://bugs.launchpad.net/bugs/972355
We have been seeing increasing reports of scarey ioctl messages in
dmesg, such as the below often in bulk:

    mdadm: sending ioctl 1261 to a partition!
    mdadm: sending ioctl 800c0910 to a partition!

Looking at the upstream discussions these are all benign and can be safely
suppressed.  This patch is based on some discussions at the link below,
on some work SUSE did in this area.  This is not suitable for upstreaming
as we need some refactoring to fix the 32bit compat ioctl mess.

Link: http://www.spinics.net/lists/raid/msg37770.html
Signed-off-by: Andy Whitcroft <apw@canonical.com>
Signed-off-by: Tim Gardner <tim.gardner@canonical.com>