Add configuration file for modulesync

https://github.com/puppetlabs/modulesync
Update .sync.yml to support new .travis.yml configs
1.5.3 prep
Sometimes killing apt is too aggressive.
Cleaned up acceptance tests

A lot of the tests were testing things that really should be tested via
unit tests, so those were deleted and unit tests will be revamped to
make sure they are covering everything they need to be covering.

Conflicts:
	spec/acceptance/unattended_upgrade_spec.rb
Cleaned up unit tests.
Missed test refactoring in CHANGELOG
Merge pull request #345 from mhaskel/merge_1.5.x_changes

Merge 1.5.x changes