Stop auto-signing rpms after pl:mock and pl:mock_all

Awhile back we decided that it would be convenient if signing of rpms happened
automatically for the release team when we did a pe:mock or pe:mock_all. While
true, we've all but ceased invoking these tasks individually ourselves, now
jenkins does most of the hard work. This means we don't sign as an integrated
task anymore, but rather as a discrete and subsequent step in the process. This
commit pulls this auto-invoke of signing out, because it will almost certainly
interfere with our transition towards the dynamic jenkins job workflow.

Signed-off-by: Moses Mendoza <moses@puppetlabs.com>
Add an alias task for pe:jenkins:uber_build

Now that the differences in workflow between PE and foss have largely been
eliminated, there is nothing in the existing jenkins dynamic setup that is
different, under the hood, between foss and PE workflows. This means adding the
dynamic job creation workflow for PE can just be an alias, which this commit
creates, as pe:jenkins:uber_build. This existing static uber_build task is
removed, now that it is superseded by the dynamic one.

Signed-off-by: Moses Mendoza <moses@puppetlabs.com>
Replace : with _ in path to artifact

We replaced : in the axis label of the dynamically created packaging job with _
because lein can't handle a : character in a file system path. Neglected was
the downstream repo creation task, which still expected the path to the
package:tar axis to be package:tar. This commit updates the repo creation job
to look in the correct path, package_tar.

Signed-off-by: Moses Mendoza <moses@puppetlabs.com>
Merge pull request #164 from MosesMendoza/maint/master/pe_dynamic_jenkins

Support dynamic jenkins workflow for PE