[Bug 1315143] [NEW] trusty SRU: change the ruby default from 1.9.1 to 2.0

[Matthias Klose]

Public bug reported:

proposing a SRU for trusty, changing the ruby default from 1.9.1 to 2.0,
and stop building the tcltk ruby bindings.

rationale: trusty currently has two ruby versions and two Tcl/Tk
versions in main. reducing these one of each lowers the maintenance
burden for the LTS.

The transition to ruby2.0/ruby2.1 in utopic is almost done, so problems
and fixes are already known on a large scale.

Packages which would need updating:

 - update ruby2.0 to the version from utopic (this one was used for all uploads in utopic,
   so it would be good to use this working version.

 - update the gem2deb and rubygems-integration packages to drop
ruby1.9.1 support.

 - rebuild all packages having a Ruby-Version: attribute without 2.0 (this is not strictly related
   to the SRU, but should be done anyway). you currently can't use ruby2.0 gems where
   this information is missing for 300+ packages. These are no-change rebuilds.

- fix build failures with 2.0 as the default.  The majority of these are caused by .install
  files pointing to outdated ruby1.9.1 locations.

Testing:

 - explicity test puppet working with 2.0

 - a test rebuild of the archive, or a partial test rebuild.

Implementation:

 - use a ppa to prepare all these changes, and then copy these changes
to trusty-proposed.

** Affects: puppet (Ubuntu)
     Importance: Undecided
         Status: New

** Affects: ruby-defaults (Ubuntu)
     Importance: Undecided
         Status: New

** Also affects: puppet (Ubuntu)
   Importance: Undecided
       Status: New

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Title:
  trusty SRU: change the ruby default from 1.9.1 to 2.0

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