[apparmor] [patch] use seperate fs with user_xattr for xattr regression tests

[Steve Beattie]

This patch modifies the xattr regression test to use a separate loopback
mounted filesystem to operate on, to guarantee that the mount option
user_xattr is enabled (it's disabled by default on Ubuntu).

With this change, a number of the user xattr testcases that were
expected to pass but weren't started working; however, some of the ones
that were failing as expected are now passing. I've touched up the
expectations as well.

After this patch is applied, the number of testcases in it that are not
matching their expected result is still annoyingly high:

$ egrep '(xpass|xfail)' xattrs.sh
    if [ $var != $link ] ; then xattrtest $var $badperm write user xfail ; fi
    xattrtest $var "$badperm+cap SYS_ADMIN" write security xfail
    xattrtest $var "$badperm+cap SYS_ADMIN" write trusted xfail
    if [ $var != $link ] ; then xattrtest $var "$badperm+cap SYS_ADMIN" write user xfail ; fi
    xattrtest $var $okperm write security xpass
    if [ $var != $link ] ; then xattrtest $var $badperm remove user xfail ; fi
    xattrtest $var "$badperm+cap SYS_ADMIN" remove security xfail
    xattrtest $var "$badperm+cap SYS_ADMIN" remove trusted xfail
    if [ $var != $link ] ; then xattrtest $var "$badperm+cap SYS_ADMIN" remove user xfail ; fi
    xattrtest $var $okperm remove security xpass

-- 
Steve Beattie
<sbeattie at ubuntu.com>
http://NxNW.org/~steve/
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