** Description changed:

  [ SRU Justification ]
- For the Phone stable overlay PPA, there's a need to occasionally have a 
package in the PPA older than those in stable-updates or stable-security.  
Other consumers of EXTRA_PPA facility could also make use of this from time to 
time to pin things above or below defaults, as seems fit.
+ For the Phone stable overlay PPA, there's a need to occasionally have a 
package in the PPA older than those in stable-updates or stable-security.  
Other consumers of the EXTRA_PPA facility could also make use of this from time 
to time to pin things above or below defaults, as seems fit.
  
- The method specced out at the core sprint was the extend the extra_ppas
+ The method specced out at the core sprint was to extend the extra_ppas
  syntax from user/ppa to user/ppa:priority, with a lack of ":priority"
  being treated as the default, both for simplicity and backward
  compatibility.
  
  [ Test Case ]
  Build a livefs with several extra_ppas at different pin levels (and with no 
pin at all), to make sure they all behave as expected, including forcefully 
downgrading for pins over 1000.  This has already been done here, however it 
can be done again with the final uploads, when they're in -proposed:
  
  https://launchpad.net/~ubuntu-cdimage/+livefs/ubuntu/vivid/ubuntu-
  core/+build/25929
  
  [ Regression Potential ]
  Very slim, given the above testing.  Builds without extra_ppas are entirely 
unaffected, and testing shows (and will show again, when repeated with the 
distro uploads) that extra_ppas specced without the :priority suffix are 
treated the same as they were before.

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https://bugs.launchpad.net/bugs/1450257

Title:
  Modify cdimage build process to allow pin priorities for EXTRA_PPAs

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