Revert "Switch to token auth for Zammad"

This reverts commit 7fef65b66b.

rt2zammad.py

@@ -27,7 +27,9 @@ class Tag(Resource):
 
 TEMPLATE = """{
 "zammad_host": "",
-"zammad_token": "",
+"zammad_user": "",
+"zammad_password": "",
+"zammad_secure": true,
 "rt_url": "",
 "rt_user": "",
 "rt_pass": ""
@@ -55,7 +57,9 @@ with open("rt2zammad.json") as handle:
 def get_zammad(**kwargs):
     return ZammadAPI(
         host=config["zammad_host"],
-        http_token=config["zammad_token"],
+        username=config["zammad_user"],
+        password=config["zammad_password"],
+        is_secure=config["zammad_secure"],
         **kwargs
     )