New module: manage Citrix Netscaler service configuration (network/netscaler/netscaler_service) (#25129)

* netscaler_service initial implementation

* Changes as requested by reviewers

* Skip some tests if under python2.6 and importing requests library

* Change option "operation" to "state"

* Remove print statements from netscaler module utils

* Catch all exceptions during login

* Fix fail message

* Add common option save_config

lib/ansible/utils/module_docs_fragments/netscaler.py

@@ -0,0 +1,52 @@
+class ModuleDocFragment(object):
+    DOCUMENTATION = '''
+
+options:
+    nsip:
+        description:
+            - The ip address of the netscaler appliance where the nitro API calls will be made.
+            - "The port can be specified with the colon (:). E.g. 192.168.1.1:555."
+        required: True
+
+    nitro_user:
+        description:
+            - The username with which to authenticate to the netscaler node.
+        required: True
+
+    nitro_pass:
+        description:
+            - The password with which to authenticate to the netscaler node.
+        required: True
+
+    nitro_protocol:
+        choices: [ 'http', 'https' ]
+        default: http
+        description:
+            - Which protocol to use when accessing the nitro API objects.
+
+    validate_certs:
+        description:
+            - If C(no), SSL certificates will not be validated. This should only be used on personally controlled sites using self-signed certificates.
+        required: false
+        default: 'yes'
+
+    nitro_timeout:
+        description:
+            - Time in seconds until a timeout error is thrown when establishing a new session with Netscaler
+        default: 310
+
+    state:
+        choices: ['present', 'absent']
+        default: 'present'
+        description:
+            - The state of the resource being configured by the module on the netscaler node.
+            - When present the resource will be created if needed and configured according to the module's parameters.
+            - When absent the resource will be deleted from the netscaler node.
+
+    save_config:
+        description:
+            - If true the module will save the configuration on the netscaler node if it makes any changes.
+            - The module will not save the configuration on the netscaler node if it made no changes.
+        type: bool
+        default: true
+'''