fix in SRU queue (Atrful/Xenial) for review by the SRU Team

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https://bugs.launchpad.net/bugs/1749389

Title:
  ntpdate lock apparmor deny

Status in ntp package in Ubuntu:
  Fix Released
Status in ntp source package in Xenial:
  Fix Committed
Status in ntp source package in Artful:
  Fix Committed

Bug description:
  [Impact]

   * Apparmor denies access to lock it shares with ntpdate to ensure no
     issues due to concurrent access

  [Test Case]

   1. get a container of target release
   2. install ntp
      apt install ntp
   3. watch dmesg on container-host
      dmesg -w
   4. restart ntp in container
      systemctl restart ntp
   => see (or no more after fix) apparmor denie:
      apparmor="DENIED" operation="file_inherit" profile="/usr/sbin/ntpd" 
name="/run/lock/ntpdate" pid=30113 comm="ntpd" requested_mask="w" 
denied_mask="w"
      Note: to not be mislead, on xenial there is a remaining stdout appamor 
      issue which is bug 1670408

  [Regression Potential]

   * we are only slightly opening up the apparmor profile, but none of the
     changes poses a security risk so regression potential on it's own
     should be close to zero.

   * There is a potential issue if the locking (that now can succeed) would
     e.g. no more be freed up or the action behind the locking would cause
     issues.

  [Other Info]

   * n/a

  On start/restart nto has an error in apparmor due to the locking it
  tries to avoid issues running concurrently with ntpdate.

  That looks like:
  apparmor="DENIED" operation="file_inherit" profile="/usr/sbin/ntpd" 
name="/run/lock/ntpdate" pid=30113 comm="ntpd" requested_mask="w" 
denied_mask="w"

  The rule we need is:
  /run/lock/ntpdate wk,

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