Dropping assert on empty desired instances set.

Bugs closed: AURORA-756

Reviewed at https://reviews.apache.org/r/26102/
Fail the build on lack of test coverage.

Reviewed at https://reviews.apache.org/r/26123/
replace 143 kB favicon with 2 kB version.
Fixing consumption double counting in quota checks.

Bugs closed: AURORA-768

Reviewed at https://reviews.apache.org/r/26160/
Perform job update no-op detection in SchedulerThriftInterface.

Bugs closed: AURORA-769

Reviewed at https://reviews.apache.org/r/26158/
Stop sending and receiving DeletedTasks framework message.

Bugs closed: AURORA-764

Reviewed at https://reviews.apache.org/r/26154/
Add a monitoring guide.

Bugs closed: AURORA-634

Reviewed at https://reviews.apache.org/r/26233/
Add usernames to scheduler update operations.

Bugs closed: AURORA-772

Reviewed at https://reviews.apache.org/r/26239/
Fix multiple errors involving bindings, and fix result codes.

- Cause an error to be raised by an unresolved binding in a configuration file.
- Fix incorrect structuring of processed bindings.
- Add a test to confirm that unbound parameters generate errors.

While I'm in the code, also fix a problem where result codes aren't returned correctly
to the shell.

Bugs closed: aurora-781

Reviewed at https://reviews.apache.org/r/26270/
Prevent initial ZK timeouts from killing the executor.

In addition, prevent uncaught exceptions from killing the executor.
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Split client creation and serverset generation.
WIP
WIP WIP WIP
WIP.
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WIP.