Fixed #10565, #11086: correctly looks up Manager DN from AD Manager a…

[wewhite]

correctly looks up Manager DN from AD Manager attribute and sets manager id

Description

AD Manager attribute is a pointer to the actual content of the manager's user record in AD.
This fix will look up the Manager DN record in AD.
The snipe user(manager) is then found, take its id and link it to the users manager id.

Fixes #10565 and #11086

Type of change

Please delete options that are not relevant.

• [ X] Bug fix (non-breaking change which fixes an issue)
• New feature (non-breaking change which adds functionality)
• Breaking change (fix or feature that would cause existing functionality to not work as expected)
• This change requires a documentation update

How Has This Been Tested?

After LDAP syncing, all Users now show Manager column filled correctly.

Test Configuration:

• PHP version:
• MySQL version
• Webserver version
• OS version

Checklist:

• [x ] I have read the Contributing documentation available here: https://snipe-it.readme.io/docs/contributing-overview
• [ x] I have formatted this PR according to the project guidelines: https://snipe-it.readme.io/docs/contributing-overview#pull-request-guidelines
• [ x] My code follows the style guidelines of this project
• [ x] I have performed a self-review of my own code
• [ x] I have commented my code, particularly in hard-to-understand areas
• I have made corresponding changes to the documentation
• My changes generate no new warnings
• I have added tests that prove my fix is effective or that my feature works
• New and existing unit tests pass locally with my changes

[welcome]

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