[packaging] Update PE versions in packaging

The packaging in puppetdb is still hardcoded to look at 2.8 and 2.7 for PE
versions by default. This commit updates these 2.9 to reflect where PE
dependencies can be resolved.

Signed-off-by: Moses Mendoza <moses@puppetlabs.com>
Merge pull request #440 from MosesMendoza/maint/master/update_pe_versions

[packaging] Update PE versions in packaging