[SPARK-1720][SPARK-1719] use LD_LIBRARY_PATH instead of -Djava.library.path

- [X] Standalone
- [X] YARN 
- [X] Mesos
- [X]  Mac OS X
- [X] Linux 
- [ ]  Windows
 
This is another implementation about #1031
cygwin seems to correctly handle the LD_LIBRARY_PATH environment variable,see:
https://cygwin.com/cygwin-ug-net/setup-env.html