Cleanup .gitignore
Cleanup .gitignore

Remove platform-specific files
Remove IDE specific files
Remove unneeded files

Change-Id: Id7b8fb738366f7665e6ac1a8b1798b6196920924

crobby/sahara,zhangjunli177/sahara,zhangjunli177/sahara,egafford/sahara,openstack/sahara,tellesnobrega/sahara,ekasitk/sahara,openstack/sahara,zhangjunli177/sahara,crobby/sahara,tellesnobrega/sahara,egafford/sahara,crobby/sahara,ekasitk/sahara,ekasitk/sahara