MINOR: Make kafka-run-class.sh work under Cygwin
MINOR: Make kafka-run-class.sh work under Cygwin

kafka-run-class.sh now runs under Cygwin; paths and classpath are set up properly.

**WARNING:**  The script was not tested on a Linux machine, only under Cygwin.  Prior to merge it into trunk, if accepted, please run a quick test to ensure nothing broke.  From my own code review, there should not be any problem, but we can never be too sure.

I do not have the environment to test it under Linux at this moment.

Author: deragon <32nx9812masakjds>

Reviewers: Ewen Cheslack-Postava <ewen@confluent.io>

Closes #1487 from deragon/trunk

TiVo/kafka,noslowerdna/kafka,ollie314/kafka,Esquive/kafka,apache/kafka,ijuma/kafka,sebadiaz/kafka,richhaase/kafka,ollie314/kafka,TiVo/kafka,lindong28/kafka,airbnb/kafka,mihbor/kafka,Ishiihara/kafka,guozhangwang/kafka,geeag/kafka,KevinLiLu/kafka,ijuma/kafka,sslavic/kafka,richhaase/kafka,apache/kafka,ErikKringen/kafka,eribeiro/kafka,themarkypantz/kafka,themarkypantz/kafka,KevinLiLu/kafka,sebadiaz/kafka,ijuma/kafka,sslavic/kafka,MyPureCloud/kafka,TiVo/kafka,Ishiihara/kafka,KevinLiLu/kafka,rhauch/kafka,apache/kafka,mihbor/kafka,lindong28/kafka,Ishiihara/kafka,guozhangwang/kafka,rhauch/kafka,sebadiaz/kafka,gf53520/kafka,geeag/kafka,Esquive/kafka,airbnb/kafka,Chasego/kafka,noslowerdna/kafka,geeag/kafka,themarkypantz/kafka,themarkypantz/kafka,eribeiro/kafka,eribeiro/kafka,sslavic/kafka,noslowerdna/kafka,gf53520/kafka,lindong28/kafka,lindong28/kafka,richhaase/kafka,MyPureCloud/kafka,airbnb/kafka,Chasego/kafka,MyPureCloud/kafka,ErikKringen/kafka,Esquive/kafka,TiVo/kafka,guozhangwang/kafka,airbnb/kafka,sebadiaz/kafka,noslowerdna/kafka,ollie314/kafka,gf53520/kafka,geeag/kafka,mihbor/kafka,apache/kafka,sslavic/kafka,Chasego/kafka,KevinLiLu/kafka,Chasego/kafka,ErikKringen/kafka,rhauch/kafka,rhauch/kafka,MyPureCloud/kafka,mihbor/kafka,eribeiro/kafka,guozhangwang/kafka,gf53520/kafka,Esquive/kafka,ijuma/kafka,richhaase/kafka,Ishiihara/kafka,ollie314/kafka,ErikKringen/kafka