(PUP-2943) Add PMT --ignore-changes

Prior to this commit there was no way to only ignore local changes to a module.
You had to --force when upgrading/uninstalling, which could potentially have other
repurcussions.
This commit adds the --ignore-changes flag, so a user can specify that they don't
care about local file changes but do not want to force anything else.
(PUP-2943) Uninstall/upgrade ignore changes spec

Adding more spec tests for the --ignore-changes flag on uninstall/upgrade
(PUP-2943) Clean ignore-changes uninstall logic
(PUP-2943) Update acceptance tests

Update wording to reflect --ignore-changes flag suggestion instead of --force.
Merge pull request #2899 from highb/fix/stable/pup-2943_ignore_changes_flag

(PUP-2943) Add PMT --ignore-changes flag
(maint) Confine enc_provides_node_when_store_configs_enabled to debian

This test has a long history of being weaned from troublesome platforms
where there are issues getting the packages installed.  The latest problem
child is centos5, now that epel is not enabled on our vcloud templates
by default.  So I'm just confining the test here to run only on debian
(except lucid, which is another problem child for this test).  Since
activerecord is slated to be removed as a store_configs backend in Puppet
4, this test is on the chopping block soon regardless.
Merge branch 'maint/stable/confine-store-configs-to-debian' into stable

* maint/stable/confine-store-configs-to-debian:
  (maint) Confine enc_provides_node_when_store_configs_enabled to debian
Merge remote-tracking branch 'upstream/stable'

* upstream/stable:
  (maint) Confine enc_provides_node_when_store_configs_enabled to debian
  (PUP-2943) Update acceptance tests
  (PUP-2943) Clean ignore-changes uninstall logic
  (PUP-2943) Uninstall/upgrade ignore changes spec
  (PUP-2943) Add PMT --ignore-changes