apparmor: support ptrace checks
    
    Kernel 4.13 introduced finer-grained ptrace checks
    
    https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux-stable.git/commit/?h=v4.13.2&id=290f458a4f16f9cf6cb6562b249e69fe1c3c3a07
    
    With kernel 4.13 and apparmor 2.11, simply starting libvirtd
    results in the following apparmor denial
    
    type=AVC msg=audit(1506112085.645:954): apparmor="DENIED"
    operation="ptrace" profile="/usr/sbin/libvirtd" pid=6984
    comm="libvirtd" requested_mask="trace" denied_mask="trace"
    peer="unconfined"
    
    Attempting to start an unconfined domain results in
    
    type=AVC msg=audit(1506112301.227:1112): apparmor="DENIED"
    operation="ptrace" profile="/usr/sbin/libvirtd" pid=7498
    comm="libvirtd" requested_mask="trace" denied_mask="trace"
    peer="/usr/sbin/libvirtd"
    
    And attempting to start a confined domain results in
    
    type=AVC msg=audit(1506112631.408:1312): apparmor="DENIED"
    operation="open" profile="virt-aa-helper" name="/etc/libnl/classid"
    pid=8283 comm="virt-aa-helper" requested_mask="r" denied_mask="r"
    fsuid=0 ouid=0
    type=AVC msg=audit(1506112631.530:1319): apparmor="DENIED"
    operation="open" profile="virt-aa-helper" name="/etc/libnl/classid"
    pid=8289 comm="virt-aa-helper" requested_mask="r" denied_mask="r"
    fsuid=0 ouid=0
    type=AVC msg=audit(1506112632.186:1324): apparmor="DENIED"
    operation="ptrace" profile="/usr/sbin/libvirtd" pid=8342
    comm="libvirtd" requested_mask="trace" denied_mask="trace"
    peer="libvirt-66154842-e926-4f92-92f0-1c1bf61dd1ff"
    
    Add ptrace rules to allow the trace operations.
    
    Resolves: https://bugzilla.suse.com/show_bug.cgi?id=1058847
    Signed-off-by: Jim Fehlig <jfehlig@suse.com>
    Reviewed-by: Guido Günther <agx@sigxcpu.org>