This is a work in progress.

We had to change some input.pp files to that they confirm to the puppet
syntax. Due to those changes some tags have changed.

In th testing.mak, using a phony target will execute the target all the
time. However for unit test input file checking, we only want to verify
inputs that have been  modified.
An empty target construct in Makefile is suitable for that.
Also update the gitignore file to ignore the empty target files.

The makefile now uses two nested defines to fully parameterize the
unit test input file parameterization.

1) Consume the stdout of the verification command. Prints too much to
the console. Useful information to debug will be printed via the makefile
echo and also the std err anyways
2) Add a clean-verify-units-input command.

Set the clean dependencies.
Get the extension parameter and use it correctly in the define block
Install further test requirements in centos container.

jq comes from epel-release.