Avoid including Optional wrapper in in scheduler thrift response message.

Bugs closed: AURORA-249

Reviewed at https://reviews.apache.org/r/19900/
Part 2 of converting from Packages to Metadata (client)

Bugs closed: AURORA-158

Reviewed at https://reviews.apache.org/r/19895/
Filtering safe domain results by hosts.

Bugs closed: AURORA-295

Reviewed at https://reviews.apache.org/r/19756/
Use a single VM for the dev cluster, manage processes with upstart.

Bugs closed: AURORA-299

Reviewed at https://reviews.apache.org/r/19939/
Fixup paths broken in previous vagrant commit, reference builds directly in dist dir.

Bugs closed: AURORA-299

Reviewed at https://reviews.apache.org/r/20011/
Before we start storing UNKNOWN (SANDBOX_DELETED) state
need to prepare for a graceful rollback of that change.

Bugs closed: AURORA-261

Reviewed at https://reviews.apache.org/r/19888/
Fix two clientv2 command-line bugs.

- Clientv2 bridge would crash and dump cookies if you didn't give it
  any command-line parameters.
- Clientv2 help formatting was messed up.

Bugs closed: aurora-307

Reviewed at https://reviews.apache.org/r/20010/
Add the "open" command to clientv2, and fix an error case in v1.

Clientv2 didn't have an "open" command, which it needed. Clientv1
had an open command, but if you used it and you forgot to specify
the parameter, it dropped its cookies.

Bugs closed: aurora-307

Reviewed at https://reviews.apache.org/r/20009/
Move some build task work away from the configure phase.

Reviewed at https://reviews.apache.org/r/20062/
Part 2 of converting from Packages to Metadata (scheduler)

Bugs closed: AURORA-158

Reviewed at https://reviews.apache.org/r/20059/
Preserving sandbox deleted task history (part 2: state machine).

Bugs closed: AURORA-261

Reviewed at https://reviews.apache.org/r/20058/
Remove duplicate task throttling behavior from TaskGroups, fix a few race conditions.

Bugs closed: AURORA-302

Reviewed at https://reviews.apache.org/r/20066/
Add a test to validate that the tutorial instructions work.

Bugs closed: AURORA-299

Reviewed at https://reviews.apache.org/r/20067/