[PerforceSCM.DataBoundConstructor] - Fixed instatination:

Hello Robert,

Just for review…
Proposed fix resolves issue with instantiation of Perforce plugin in the MultipleSCM’s hetero list ([JENKINS-18583][1]). Issue was in the incomplete handling of data in the DataBoundConstructor.

If fix is applicable, I’ll fix tests and remove test stuff from the *.pom. Then, we will be able to merge pull request.

Best regards,
Oleg Nenashev
R&D Engineer, Synopsys Inc.
www.synopsys.com

[1]: https://issues.jenkins-ci.org/browse/JENKINS-18583