MB-55677 Fix the eshell error with -d switch

These two functions:
  - get_babysitter_cookie
  - get_ns_server_cookie

are not using a tuple as param like other rest API calls, but they are
using payload instead. When the -d switch is mentioned in the eshell,
this will raise an error because the payload is sent to
_url_encode_params function where it expects param to be a tuple.
So here we are trying to avoid that function call by checking if
the parameter is actually a tuple. If not just a simple print works
fine.

Change-Id: I4973fe195902e1e12e2960f9fdf1d724b6614597
Reviewed-on: https://review.couchbase.org/c/couchbase-cli/+/187269
Well-Formed: Restriction Checker
Reviewed-by: James Lee <james.lee@couchbase.com>
Tested-by: Build Bot <build@couchbase.com>

Author: Amir Biglarbegian

cluster_manager.py

@@ -2390,7 +2390,10 @@ def _get(self, url, params=None):
     @request
     def _post_form_encoded(self, url, params):
         if self.debug:
-            print(f'POST {url} {self._url_encode_params(params)}')
+            if len(params) and not isinstance(params[0], tuple):
+                print(f'POST {url} {params}')
+            else:
+                print(f'POST {url} {self._url_encode_params(params)}')
 
         return self._handle_response(self.session.post(url, auth=(self.username, self.password), data=params,
                                                        verify=self.ca_cert, timeout=self.timeout, headers=self.headers))