Fix 774, update container request logic to allow multiple containers of different memory amounts to be allocated
Merge remote-tracking branch 'origin' into YingdaReef
minor change to add this. prefix, for consistency
Merge branch 'master' of https://github.com/Microsoft-CISL/REEF into YingdaReef
Merge branch 'YingdaReef' of https://github.com/Microsoft-CISL/REEF into YingdaReef
Merge remote-tracking branch 'origin' into YingdaReef
add synchronized block when managing conatiner request queue
Merge branch 'master' of github.com:Microsoft-CISL/REEF into YingdaReef
Merge branch 'master' of github.com:Microsoft-CISL/REEF into YingdaReef
minor fixes in YarnContainerManager - code cleanup, simplify
synchronization, use proper logging etc.
Merge pull request #785 from Microsoft-CISL/YingdaReef

Update the container request logic to allow multiple containers of different memory amounts