Werk #1587: Prevent logging of passwords during initial distributed site login

When creating a distributed monitoring setup using WATO, after configuring a remote site in the central site, you need to login into the remote site as admin user once to establish a trust between both sites.

This login was made using a HTTP get request, which is logged in the access logs of the affected webservers (local system apache, local site apache, remote system apache, remote site apache). All these log entries contain the whole GET query string, which also includes the inserted username and password.

This has been fixed by replacing the GET request with a POST request where the request vars are not logged in the access log.

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