allow user to set job submission directory
rename to DriverJobSubmissionDirectory
remove dup
update java doc
add more java doc
update more java doc from CR
Merge branch 'master' of https://github.com/Microsoft-CISL/REEF into yingdac-allow-setting-of-jobsubmissiondirectory
Merge pull request #974 from Microsoft-CISL/yingdac-allow-setting-of-jobsubmissiondirectory

allow setting of jobsubmissiondirectory