Fix Python 3.11 compatibility.

Use `inspect.getfullargspec` instead of the removed
`inspect.getargspec` on Python 3. Fixes robotframework#81.

Author: pekkaklarck

src/robotremoteserver.py

@@ -30,7 +30,10 @@
     from xmlrpclib import Binary, ServerProxy
     from collections import Mapping
     PY2, PY3 = True, False
+    def getfullargspec(func):
+        return inspect.getargspec(func) + ([], None, {})
 else:
+    from inspect import getfullargspec
     from io import StringIO
     from xmlrpc.client import Binary, ServerProxy
     from xmlrpc.server import SimpleXMLRPCServer
@@ -308,7 +311,7 @@ def get_keyword_arguments(self, name):
         if __name__ == '__init__':
             return []
         kw = self._get_keyword(name)
-        args, varargs, kwargs, defaults = inspect.getargspec(kw)
+        args, varargs, kwargs, defaults, _, _, _ = getfullargspec(kw)
         if inspect.ismethod(kw):
             args = args[1:]  # drop 'self'
         if defaults:
@@ -371,8 +374,8 @@ def __init__(self, library, get_keyword_names, run_keyword):
             = dynamic_method(library, 'get_keyword_tags')
 
     def _get_kwargs_support(self, run_keyword):
-        spec = inspect.getargspec(run_keyword)
-        return len(spec.args) > 3    # self, name, args, kwargs=None
+        args = getfullargspec(run_keyword)[0]
+        return len(args) > 3    # self, name, args, kwargs=None
 
     def run_keyword(self, name, args, kwargs=None):
         args = [name, args, kwargs] if kwargs else [name, args]