Support for adding Certificate Authorities for LDAP Authentication

[exedore6]

Desired Behavior

To be able to add an internal certificate authority's certificate to the netbox container. Additionally it would be awful nice to tell the ldap code to support a client side certificate (in order to connect to something like GSuite's LDAP backend)
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Contrast to Current Behavior

If ldap authentication is configured in the netbox container, and the ldap server is using a certificate that isn't signed by an official CA, the validation fails, and therefore, the login fails.

At the moment, the only documented, supported option is to set the LDAP_IGNORE_CERT_ERRORS environment variable in the docker-compose.override.yml to "true"
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Changes Required

A volume mapping from the project directory to create the appropriate certificate file, and possibly an environment variable to specify the TLS_CACERT string to the appropriate location. Additionally a change to ldap_config.py to pass the variable to django.
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Discussion: Benefits and Drawbacks

People who are running netbox internally can enjoy actual host validation when using LDAP authentication.
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[cimnine]

You will be able to implement this on your own by leveraging #343 .

[cimnine]

Netbox Docker 0.26.0 was just released which addresses this issue.