CP2K package: add versions and tests, adjust optimization flags (#11263)
CP2K package: add versions and tests, adjust optimization flags (#11263)

* Remove -ffast-math optimization flag
* Add 'develop' version which points to git repo
* Depend on libint for all versions >= 3.0
* Build directory is different for versions >= 7 (including develop)
* Add "make test" as post install check
LLNL/spack,iulian787/spack,iulian787/spack,iulian787/spack,LLNL/spack,LLNL/spack,LLNL/spack,iulian787/spack,LLNL/spack,iulian787/spack