Removing rollback_on_failure from restart options.

Bugs closed: AURORA-247

Reviewed at https://reviews.apache.org/r/18819/
Added cluster name to page title.

Added a ServerInfo struct to each thrift response.

Testing Done:
gradle clean build.
gradle run.

Bugs closed: AURORA-120

Reviewed at https://reviews.apache.org/r/17562/
Count on task timeouts and task pruning to be idempotent, simplifying handling
code.

Reviewed at https://reviews.apache.org/r/18484/
Bump protobuf version to match version used by mesos library.

Bugs closed: AURORA-250

Reviewed at https://reviews.apache.org/r/18913/
Added an optional JobKey set filter into the TaskQuery.

Bugs closed: AURORA-235

Reviewed at https://reviews.apache.org/r/18655/
Refactored admin client commands to take advantage of new TaskQuery fields.

Bugs closed: AURORA-239

Reviewed at https://reviews.apache.org/r/18720/
Move and unit test Maintenance module and commands

Bugs closed: AURORA-223

Reviewed at https://reviews.apache.org/r/18334/
AURORA-227: Aurora build should check for the Python version