Update EC Config db for new scheduling object data models

[bmort]

Description:

This is a pre-release update to the Config DB library to support a updated workflow definition and scheduling object data models (PB/SBI) identified as as part of TSK-2710 (Prepare SIP pipelines to work automatically within SIP framework) . This also updates unit test coverage of the Config DB library to near 100% (only the low level Redis API is now missing 100% coverage). Note that this is tagged a as prerelease version as this version of the Config DB API will not currently work with the release versions of other SIP libraries and components.

• Updated release version of the EC Config db to 1.3.0a1. The 'a1' or Alpha 1 tag meets pep404 naming and allows this to be published as a pre-release on pypi.
• Updated SIP workflow definition schema to version 2.0 based on analysis of requirements from the visibility ingest workflow.
• Added documentation for the workflow schema to the docs folder.
• Updated SBI configuration JSON schema to version 2.0.
• Added documentation of the SBI configuration JSON data structure.
• Added documentation of the configuration database physical data model for PBs and SBIs.
• Updated the configuration database scheduling module methods to reflect changes in the workflow definition, PB and SBI data models.
• Updated unit tests to improve test coverage.
• Updated --test-only option of test runner to include unit test coverage reporting.

Testing instructions:

Unit tests are run automatically by TravisCI but can also be run from the top level SIP repo folder with the following command:

./tools/run_tests.sh sip/execution_control/configuration_db

Types of changes

• [ ] Bug fix (non-breaking change that fixes an issue)
• [x] New feature (non-breaking change that adds functionality)
• [x] Breaking change (fix or feature that would cause existing functionality to change)

Checklist:

• [x] The code follows the code style of this project.
• [x] The changes require a documentation update.
• [x] Documentation has been updated accordingly.
• [x] Tests cover all changes in this PR.
• [x] All new and existing tests passed.

[codecov[bot]]

Codecov Report

Merging #77 into master will increase coverage by 0.77%. The diff coverage is 99.23%.

@@            Coverage Diff             @@
##           master      #77      +/-   ##
==========================================
+ Coverage   86.07%   86.85%   +0.77%     
==========================================
  Files          59       35      -24     
  Lines        2671     1734     -937     
  Branches      221      193      -28     
==========================================
- Hits         2299     1506     -793     
+ Misses        321      208     -113     
+ Partials       51       20      -31

Impacted Files	Coverage Δ
...iguration_db/sip_config_db/states/service_state.py	100% <ø> (+14.81%)	:arrow_up:
...iguration_db/sip_config_db/utils/datetime_utils.py	100% <ø> (+28.57%)	:arrow_up:
...figuration_db/sip_config_db/scheduling/resource.py	100% <ø> (+10.52%)	:arrow_up:
...uration_db/sip_config_db/scheduling/tests/utils.py	100% <100%> (ø)
...ip_config_db/scheduling/_scheduling_object_list.py	100% <100%> (+15.38%)	:arrow_up:
...on_db/sip_config_db/scheduling/processing_block.py	100% <100%> (+4.31%)	:arrow_up:
...iguration_db/sip_config_db/states/_state_object.py	100% <100%> (+16.03%)	:arrow_up:
..._db/sip_config_db/scheduling/_scheduling_object.py	100% <100%> (+24.63%)	:arrow_up:
.../configuration_db/sip_config_db/states/services.py	100% <100%> (+36.36%)	:arrow_up:
...tion_db/sip_config_db/scheduling/workflow_stage.py	100% <100%> (+6.25%)	:arrow_up:
... and 28 more

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