We can now use the standard nodejs4 tests and don't need the legacy jobs
anymore.
The standard nodejs4 tests life in project-config, so the dependent job
moves them there.
Remove the old jobs here.
Depends-On: I80dea47f0ba43f74e074ba61b465e3f7d4f28952
Change-Id: Ic876453ffe8cd5cbfa89ba99b9f257683ca595c1