* add new step buildSetResult
* set pipeline result in post stage
* exclude buildSetResult from commonStepTests
* extend pipeline test
* remove post stage reference
* Project "Piper" Template: framework and structure
This is the first in a series of Pull-Requests to provide a fully functional Pipeline template into the library.
This PR contains:
* general Pipeline structure incl. tests
* Pipeline initialization incl. tests
* Hollow pipeline stages incl. tests
* first set of default values
* add gitUrls to commonPipelineEnvironment
* set correct git information on commonPipelineEnvironment
* add wrapper for stages contained in library
`piperStageWrapper` provides a wrapper for stages which we may include into the library.
It will take care about extension capabilities, locking, node handling, ... which should be a capability of every stage contained in the library.
