Fix Issue121 122

[jcwalker]

Pull Request (PR) description

Fixes issue #121 - Max password age fails when setting to 0 Fixes issue #122 - Domain_controller_LDAP_server_signing_requirements - Require Signing

This Pull Request (PR) fixes the following issues

Fixes issue #121 Fixes issue #122

Task list

• [x] Added an entry under the Unreleased section of the change log in the README.md. Entry should say what was changed, and how that affects users (if applicable).
• [x] Resource documentation added/updated in README.md.
• [x] Resource parameter descriptions added/updated in README.md, schema.mof and comment-based help.
• [x] Comment-based help added/updated.
• [x] Localization strings added/updated in all localization files as appropriate.
• [x] Examples appropriately added/updated.
• [x] Unit tests added/updated. See DSC Resource Testing Guidelines.
• [x] Integration tests added/updated (where possible). See DSC Resource Testing Guidelines.
• [x] New/changed code adheres to DSC Resource Style Guidelines and Best Practices.

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This change is 

[codecov-io]

Codecov Report

Merging #125 into dev will decrease coverage by <1%. The diff coverage is 96%.

@@        Coverage Diff         @@
##           dev   #125   +/-   ##
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- Coverage   89%    89%   -1%     
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  Files        5      5           
  Lines      493    497    +4     
==================================
+ Hits       443    446    +3     
- Misses      50     51    +1