New class ChangeLogChecker (C4-913, C4-915)

[netsettler]

• Make a new class ChangeLogChecker that raises an AssertionError rather than just warning if CHANGELOG.rst is inconsistent with pyproject.toml. (part of C4-915)

Opportunistic (part of C4-913)

• In secrets_utils:

  • Add SecretsTable.PLACEHOLDER_VALUE to hold the GAC placeholder value.
  • Add SecretsTable.is_placeholder_value() class method (predicate to detect placeholder)
  • Add SecretsTable.is_empty_value() class method (predicate to detect null or placeholder)

[coveralls]

Pull Request Test Coverage Report for Build 3061885644

• 15 of 15 (100.0%) changed or added relevant lines in 2 files are covered.
• No unchanged relevant lines lost coverage.
• Overall coverage increased (+0.05%) to 71.287%

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Totals
Change from base Build 3023897535:	0.05%
Covered Lines:	5467
Relevant Lines:	7669

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💛 - Coveralls