Properly handle filtering offers when multiple attributes have the same name.

Bugs closed: AURORA-264

Reviewed at https://reviews.apache.org/r/19250/
Add killall.

- the kill command now requires a shards parameter.
- to kill shards of a job, users must use the new "killall" command.

Bugs closed: aurora-260

Reviewed at https://reviews.apache.org/r/19159/
Renaming packages to packagesDEPRECATED in client.

Reviewed at https://reviews.apache.org/r/19331/