[pdqtest-2.0] - tweak PDK integration to avoid churn

[GeoffWilliams]

From slack chat on puppet #testing:

create Gemfile.project and then in Makefile and make.ps1 copy it over to Gemfile.local. When these scripts run, die with an error if Gemfile.local already exists with different content otherwise proceed to bundle exec.... To get the initial set of files, do pdk new module --skip-interview in a tempdir and copy the files I want during pdqtest init. pdqtest init will also drop a .sync.yml to prevent pdk update clobbering integrations in .travis.yml and bitbucket-pipelines.yml ... get vanilla PDK files when you do pdk new module and your not wanting to use PDQTest.

Also if the Gemfile already exits on a project created with PDK, just leave it alone and never touch it

[GeoffWilliams]

fixed in 1.9.9beta