293034: Change p2 paths so multiple versions won't collide with each other. (temporary until can change tools to generate composite repository.
293034: Change p2 paths so multiple versions won't collide with each other. (temporary until can change tools to generate composite repository.

Former-commit-id: 3eba408f7820149077dad581db34b1674f669cbe
bfg-repo-cleaner-demos/eclipselink.runtime-bfg-strip-big-blobs,bfg-repo-cleaner-demos/eclipselink.runtime-bfg-strip-big-blobs,bfg-repo-cleaner-demos/eclipselink.runtime-bfg-strip-big-blobs