I've uploaded the patch in comment #3 to xenial.  I've also added some
SRU bits to the description -- if either Robie or Philip could maybe add
some test case steps, that would be swell.  Thanks!

** Description changed:

  In 1:4.2.8p3+dfsg-1, the default config was changed to
  "Use pool instead of server".  This needs a corresponding
  update to /etc/dhcp/dhclient-exit-hooks.d/ntp, since the
  DHCP specified servers now get added to the default pool
  config instead of replacing them.
  
  This affects Xenial only as the Yakkety build includes the upstream fix
  (1:4.2.8p7+dfsg-1).
  
- Original Debian busg https://bugs.debian.org/cgi-bin/bugreport.cgi?bug=809344 
+ Original Debian busg https://bugs.debian.org/cgi-bin/bugreport.cgi?bug=809344
  & https://bugs.debian.org/cgi-bin/bugreport.cgi?bug=806676
+ 
+ [Test Case]
+ 
+ mterry isn't sure on this.  Robie or Philip, do you have simple
+ instructions?
+ 
+ [Regression Potential]
+ 
+ As noted in comments #1 and #2, this SRU might surface an issue if the
+ user is receiving a broken set of NTP servers.
+ 
+ And as noted in comment #4, some people might be hackishly using the
+ distinction between spaces and tabs in the config file to trick our
+ current hook.  Debian has gotten rid of that distinction, so that hack
+ will stop working on distro-upgrade anyway.  The fix is *probably* going
+ to help more people who unintentionally mixed the two up rather than the
+ few that are relying on that bug.  But that bit can be easily dropped
+ from the SRU if ya like.

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https://bugs.launchpad.net/bugs/1656801

Title:
  ntp: changing the default config from server to pool broke the dhcp
  hook

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