[Bug 1560536] [NEW] Add method of appending accessing default userdata

[Max Brustkern]

Public bug reported:

For lp:auto-upgrade-testing-specifications, we use userdata based on the
DEFAULT_USERDATA  in adt-buildvm-ubuntu-cloud. If that were easily
programmatically accessible, we could make sure we always update our
userdata based on changes to it.

Alternately, if we had some method of saying "use the default userdata
plus append this," that would accomplish the same goal but be slightly
easier on our end.

** Affects: autopkgtest (Ubuntu)
     Importance: Undecided
         Status: Incomplete

** Summary changed:

- Add method of accessing default userdata
+ Add method of appending accessing default userdata

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https://bugs.launchpad.net/bugs/1560536

Title:
  Add method of appending accessing default userdata

Status in autopkgtest package in Ubuntu:
  Incomplete

Bug description:
  For lp:auto-upgrade-testing-specifications, we use userdata based on
  the DEFAULT_USERDATA  in adt-buildvm-ubuntu-cloud. If that were easily
  programmatically accessible, we could make sure we always update our
  userdata based on changes to it.

  Alternately, if we had some method of saying "use the default userdata
  plus append this," that would accomplish the same goal but be slightly
  easier on our end.

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