Add custom apparmor profile for cloudron apps

Docker generates an apparmor profile on the fly under /etc/apparmor.d/docker.
This profile gets overwritten on every docker daemon start.

This profile allows processes to ptrace themselves. This is required by
circus (python process manager) for reasons unknown to me. It floods the logs
with
    audit[7623]: <audit-1400> apparmor="DENIED" operation="ptrace" profile="docker-default" pid=7623 comm="python3.4" requested_mask="trace" denied_mask="trace" peer="docker-default"

This is easily tested using:
    docker run -it cloudron/base:0.3.3 /bin/bash
        a) now do ps
        b) journalctl should show error log as above

    docker run --security-opt=apparmor:docker-cloudron-app -it cloudron/base:0.3.3 /bin/bash
        a) now do ps
        b) no error!

Note that despite this, the process may not have ability to ptrace since it does not
have CAP_PTRACE. Also, security-opt is the profile name (inside the apparmor config file)
and not the filename.

References:
    https://groups.google.com/forum/#!topic/docker-user/xvxpaceTCyw
    https://github.com/docker/docker/issues/7276
    https://bugs.launchpad.net/ubuntu/+source/docker.io/+bug/1320869

This is an infra update because we need to recreate containers to get the right profile.

Fixes #492

setup/container/docker-cloudron-app.apparmor

@@ -0,0 +1,32 @@
+#include <tunables/global>
+
+
+profile docker-cloudron-app flags=(attach_disconnected,mediate_deleted) {
+
+  #include <abstractions/base>
+
+  ptrace peer=@{profile_name},
+
+  network,
+  capability,
+  file,
+  umount,
+
+  deny @{PROC}/sys/fs/** wklx,
+  deny @{PROC}/sysrq-trigger rwklx,
+  deny @{PROC}/mem rwklx,
+  deny @{PROC}/kmem rwklx,
+  deny @{PROC}/sys/kernel/[^s][^h][^m]* wklx,
+  deny @{PROC}/sys/kernel/*/** wklx,
+
+  deny mount,
+
+  deny /sys/[^f]*/** wklx,
+  deny /sys/f[^s]*/** wklx,
+  deny /sys/fs/[^c]*/** wklx,
+  deny /sys/fs/c[^g]*/** wklx,
+  deny /sys/fs/cg[^r]*/** wklx,
+  deny /sys/firmware/efi/efivars/** rwklx,
+  deny /sys/kernel/security/** rwklx,
+}
+