Venkatasubrahmanian Narayanan

Some committers require a job-wide UUID to function correctly. Adding the AM JobID to the JobConf will allow applications to pass that to the committers that need it.

### What changes were proposed in this pull request? HCatStorer now respects hive.file.output.extension for the output files it writes. ### Why are the changes needed? Brings HCatStorer's feature set more...