[FIXED JENKINS-14545] Correct Env variables

Extend and correct Enviroment variables that are provided when
using block until other projects are completed, in the trigger/call
other projects buildstep.

Extended vaiables to provide the full list of projects triggered, and
the full list of builds triggered when using the parameter factories.

Conflicts:

	src/main/java/hudson/plugins/parameterizedtrigger/BuildInfoExporterAction.java
[FIXED JENKINS-14545] Correct and add testcases for Env variables

Conflicts:

	src/test/java/hudson/plugins/parameterizedtrigger/test/BuildInfoExporterTest.java