ubuntu-core-launcher needs urandom access

[Chad Miller]

systemd[1]: Started Service for snap application tor-middle-relay.daemon.
kernel: [1084216.108581] type=1400 audit(1466564994.109:51): apparmor="DENIED" operation="open" parent=1 profile="/usr/bin/ubuntu-core-launcher" name="/dev/urandom" pid=21206 comm="ubuntu-core-lau" requested_mask="r" denied_mask="r" fsuid=0 ouid=0
ubuntu-core-launcher[21206]: seccomp_load failed with -22
ubuntu-core-launcher[21206]: aborting. errmsg: Invalid argument
systemd[1]: snap.tor-middle-relay.daemon.service: Main process exited, code=exited, status=1/FAILURE
systemd[1]: snap.tor-middle-relay.daemon.service: Unit entered failed state.
systemd[1]: snap.tor-middle-relay.daemon.service: Failed with result 'exit-code'.
systemd[1]: snap.tor-middle-relay.daemon.service: Service hold-off time over, scheduling restart.
systemd[1]: Stopped Service for snap application tor-middle-relay.daemon.

ProblemType: Bug
DistroRelease: Ubuntu 16.04
Package: snapd 2.0.9
ProcVersionSignature: Ubuntu 3.2.0-1412.16-omap4 3.2.14
Uname: Linux 3.2.0-1412-omap4 armv7l
ApportVersion: 2.20.1-0ubuntu2.1
Architecture: armhf
Date: Tue Jun 21 23:18:35 2016
SourcePackage: snapd
UpgradeStatus: Upgraded to xenial on 2016-05-11 (42 days ago)

[Jamie Strandboge (jdstrand)]

https://github.com/snapcore/snap-confine/pull/62