[SP-1377] - Regression of PRD-5172 - PRPT created in PRD 3.9.3 does not open in 5.0.5, 5.0.6, 5.0.7 and 5.1 (5.1)

cherry-pick from master of https://github.com/pentaho/pentaho-reporting/commit/93da5108965f05cfa7e95811730dc9244b6335b6
PRD-5166 - Update Sample-Data connection to not use local file database. This prevents parallel execution.
(cherry picked from commit 67b0777)
[BUILD] - Ensured that all build.xml files have a valid continuous-local-junit target so that tests run fast.
This cuts the time to validate the build from 3+ hours to roughly 1h by avoiding Cobertura.
Merge pull request #474 from tmorgner/5.1-build-fix

5.1 build fix for JUnit based validation of pull requests
Merge pull request #471 from aliakseihaidukou/SP-1377

[SP-1377] - Regression of PRD-5172 - PRPT created in PRD 3.9.3 does not ...