Ship known params in jenkins ship

This commit updates the jenkins ship task to write the current build parameters
(e.g., distribution_server, version(s), etc.) to the 'pkg' directory before
shipping, so that they are shipped out to our artifacts directory. This file
will later be used in our promotion workflow.

Signed-off-by: Moses Mendoza <moses@puppetlabs.com>
Add pe:jenkins:retrieve task

So that pe projects don't have to switch over to the 'pl:' namespace to
retrieve. It's confusing.
Merge pull request #210 from MosesMendoza/RE-322/master/ship_params

Ship known params in jenkins ship
Merge pull request #209 from MosesMendoza/RE-273/master/add_pe_retrieve_for_sanity

Add pe:jenkins:retrieve task