Platform bom (BZ-989519): Remove unneeded version declarations (parent pom already declares them)
(cherry picked from commit 0fb7f3d6554146801d3e929e9a0f87794c6d605a)

Conflicts:

	jbpm-console-ng-process-runtime/jbpm-console-ng-process-runtime-client/pom.xml
	jbpm-console-ng-showcase/pom.xml