Moved windows node stop to its own function
Moved windows node stop to its own function

In testing there was an intermittent issue where stop-server.bat did not
properly kill cassandra. If that occurs, the old windows kill method is
reverted to.

josh-mckenzie/ccm,mikefero/ccm,tolbertam/ccm,mike-tr-adamson/ccm,thobbs/ccm,jorgebay/ccm,kishkaru/ccm,aboudreault/ccm,pcmanus/ccm,spodkowinski/ccm,mike-tr-adamson/ccm,pcmanus/ccm,bcantoni/ccm,slivne/ccm,unusedPhD/ccm,pcmanus/ccm,EnigmaCurry/ccm,tolbertam/ccm,bcantoni/ccm,pombredanne/ccm,mambocab/ccm,umitunal/ccm,jeffjirsa/ccm,mike-tr-adamson/ccm,AtwooTM/ccm,mikefero/ccm,thobbs/ccm