[CMSSW_7_0_X] config.map update, add py2-python-dateutil-toolfile and xrootd 3.3.3

**ChangeLog**
- Remove all GCC 4.7.2 architectures except *stable (slc5_amd64_gcc472)*. Add _osx108_amd64_gcc481_.
- Add missing _py2-python-dateutil-toolfile.spec_ needed for _matplotlib_.
- Finally add _xrootd 3.3.3_.