Fix is trivial, but you never know - tetsing the bionic change in
https://launchpad.net/~ci-train-ppa-service/+archive/ubuntu/3144

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

Title:
  ntpdate lock apparmor deny

Status in ntp package in Ubuntu:
  Triaged
Status in ntp source package in Xenial:
  Triaged
Status in ntp source package in Artful:
  Triaged

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"

  [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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