IPAAnsibleModule: add support for ldap_cache configuration.

This patch adds support for configuring IPA API connection use of
LDAP cache. It adds a new variable 'ipaapi_ldap_cache' to the base
module, and provides the variable documentation in its doc fragment.

plugins/doc_fragments/ipamodule_base_docs.py

@@ -37,4 +37,8 @@ options:
       determined by the execution environment.
     choices: ["server", "client"]
     required: false
+  ipaapi_ldap_cache:
+    description: Use LDAP cache for IPA connection.
+    type: bool
+    default: true
 """

plugins/module_utils/ansible_freeipa_module.py

@@ -629,6 +629,7 @@ else:
             ipaapi_context=dict(
                 type="str", required=False, choices=["server", "client"],
             ),
+            ipaapi_ldap_cache=dict(type="bool", default="True"),
         )
 
         def __init__(self, *args, **kwargs):