AARE doesn't work as first character in srcname for mount rules

With this denial:
kernel: [543599.764711] audit: type=1400 audit(1471291418.387:7568): apparmor="DENIED" operation="mount" info="failed mntpnt match" error=-13 profile="snap.snap-fuse-test.sh" name="/var/snap/snap-fuse-test/x3/mnt/" pid=4987 comm="fusexmp" fstype="fuse.fusexmp" srcname="fusexmp" flags="rw, nosuid, nodev"

I noticed that this rule will allow the mount when it should not (ie, intent is to allow any mount with a srcname that doesn't start with '/'):

mount [^/]** -> **,

Note, srcname's do not start with '/' with fuse mounts. This issue was found when developing policy for snappy, but it can be worked around and is not a critical bug for Ubuntu.