Fix non-matching defaults in docs (#5446)

* Allow to pass options as lookup options.

* Adjust tests.

* Fix non-matching defaults.

plugins/doc_fragments/influxdb.py

@@ -43,6 +43,7 @@ options:
     - The path on which InfluxDB server is accessible
     - Only available when using python-influxdb >= 5.1.0
     type: str
+    default: ''
     version_added: '0.2.0'
   validate_certs:
     description:
@@ -80,4 +81,5 @@ options:
     description:
     - HTTP(S) proxy to use for Requests to connect to InfluxDB server.
     type: dict
+    default: {}
 '''

plugins/doc_fragments/ldap.py

@@ -23,6 +23,7 @@ options:
     description:
       - The password to use with I(bind_dn).
     type: str
+    default: ''
   dn:
     required: true
     description:

plugins/doc_fragments/utm.py

@@ -17,6 +17,7 @@ options:
           - Is needed for some modules
         type: dict
         required: false
+        default: {}
     utm_host:
         description:
           - The REST Endpoint of the Sophos UTM.