Refactor config logic for bools

If a config paramenter is a boolean, the resulting configuration is the
logic and of all those given (including defaults). BEWARE in future
config implementations!

config.yml

@@ -11,7 +11,7 @@ ldap:
 
     encryption: TLSv1.2 # Can either be None or TLSv1.2. Default: None
     ciphers: "HIGH"
-    validate: True # Can either be True or False. Default: False
+    validate: False # Can either be True or False. Default: False
     ca_certs: openldap/cert.pem
 
     username: uid=phi,ou=Services,dc=unit,dc=macaomilano,dc=org
@@ -19,7 +19,6 @@ ldap:
 
     base_dn: dc=unit,dc=macaomilano,dc=org
     attribute_id: uid
-    attribute_mail: mail
 
 
 logging:

src/phi/config.py

@@ -125,6 +125,8 @@ def recursive_merge(main_config, aux_config):
             if aux is not None:
                 _main.extend(aux)
             _ret_config[key] = list(set(_main))
+        elif isinstance(default, bool):
+            _ret_config[key] = default and aux and main
         else:
             if main is not None:
                 _ret_config[key] = main