Add support for socks connection to Git backend (#17640)

* Add support for socks connection to Git backend

* cleanup socks detection

* add documentation for installing python_socks

* dont need lower()

* cleanup

* refactor Socks to utilities

* fix imports

* fix missing comma

* Update docs/features/synchronized-data.md

Co-authored-by: Jeremy Stretch <jstretch@netboxlabs.com>

* review feedback

* Update docs/features/synchronized-data.md

Co-authored-by: Jeremy Stretch <jstretch@netboxlabs.com>

* review changes

---------

Co-authored-by: Jeremy Stretch <jstretch@netboxlabs.com>

docs/features/synchronized-data.md

@@ -13,6 +13,9 @@ To enable remote data synchronization, the NetBox administrator first designates
 !!! info
     Data backends which connect to external sources typically require the installation of one or more supporting Python libraries. The Git backend requires the [`dulwich`](https://www.dulwich.io/) package, and the S3 backend requires the [`boto3`](https://boto3.amazonaws.com/v1/documentation/api/latest/index.html) package. These must be installed within NetBox's environment to enable these backends.
 
+!!! info
+    If you are configuring Git and have `HTTP_PROXIES` configured to use the SOCKS protocol, you will also need to install the [`python_socks`](https://pypi.org/project/python-socks/) Python library.
+
 Each type of remote source has its own configuration parameters. For instance, a git source will ask the user to specify a branch and authentication credentials. Once the source has been created, a synchronization job is run to automatically replicate remote files in the local database.
 
 The following NetBox models can be associated with replicated data files: