Adds ionice command permutations to rootwrap filters

When setting volume_clear_ionice, the ionice command is prepended to a dd
command before executing it.  Previously, this would have failed because it
wasn't allowed through the default rootwrap filters.  This commit fixes this
problem.

Note that due to the way that the RegExpFilter works, we need three different
expressions to cover all cases.  This is because the various options result
in a different number of arguments.  And this filter will fail immediately
if the number of arguments is incorrect.

Change-Id: Ie29f7fa21b34982ed5394c2c8f38c3e066ef0112
Closes-Bug: #1300496
Change iogrp property when retyping for Storwize/SVC

If need migration when retyping, Storwize/SVC driver will add a copy
of the volume first, and then start a task to check volume sync
progress which will run each 10 mins. At last delete the origin copy
when sync finished.

But iogrp property is not a parameter of addvdiskcopy, so the iogrp
of the copy volume is the same as the origin. If iogrp property is
diff between the old and new volume type, the property will not
change when retyped.

Change-Id: Ie4414bcf95fa6e61d7d618618f48837eef740da4
closed-bug: #1298247
Merge "Adds ionice command permutations to rootwrap filters"
Merge "Change iogrp property when retyping for Storwize/SVC"