WS-195, WS-76: Notification System now working and sending emails on request submission and completion

Charlotte Hausman authored 4 years ago and Nathan Hertz committed 4 years ago

Messaging system is now running on a more robust foundation:
- `kombu` package for AMQP networking
- New Messenger and Router objects
- New message format
- Easy-to-use callback subscribing
- Can now get messages anywhere in the system easily and send replies back easily

Updated `testing/utils/conftest.py` with reliable mock data that can be used in tests; added `shared/workspaces` tests

WS-101: figured out how to write pytest tests. test_load_engine works, stubs for other tests created

Refactored execution management logic out of `CapabilityService` into a new class `ExecutionManager`

updated coveragerc config files to reflect changes to the shared packages location and modified run-tests.sh

installs all requirements required by all 3 services; new rule: make
clean, which cleans up your Python environment and your Docker environment; make test now runs setup.py files for all packages