library: reduce usage of ansible python module

The unit tests should run without requiring the
ansible module.

At least, all currently existing tests can now run.
In the future, we might have tests that optionally
only run when the ansible libraries are available.

library/network_connections.py

@@ -218,15 +218,16 @@ class Util:
 
     @staticmethod
     def boolean(arg):
-        import ansible.module_utils.basic as basic
+        BOOLEANS_TRUE = ['y', 'yes', 'on', '1', 'true', 1, True]
+        BOOLEANS_FALSE = ['n', 'no', 'off', '0', 'false', 0, False]
 
         if arg is None or isinstance(arg, bool):
             return arg
         if isinstance(arg, Util.STRING_TYPE):
             arg = arg.lower()
-        if arg in basic.BOOLEANS_TRUE:
+        if arg in BOOLEANS_TRUE:
             return True
-        elif arg in basic.BOOLEANS_FALSE:
+        elif arg in BOOLEANS_FALSE:
             return False
         else:
             raise MyError('value "%s" is not a boolean' % (arg))
@@ -1393,9 +1394,6 @@ class _AnsibleUtil:
     ARGS_CONNECTIONS = ArgValidator_ListConnections()
 
     def __init__(self):
-        from ansible.module_utils.basic import AnsibleModule
-
-        self.AnsibleModule = AnsibleModule
         self._module = None
         self._connections = None
         self._run_results = None
@@ -1428,7 +1426,8 @@ class _AnsibleUtil:
     def module(self):
         module = self._module
         if module is None:
-            module = self.AnsibleModule(
+            from ansible.module_utils.basic import AnsibleModule
+            module = AnsibleModule(
                 argument_spec = self.ARGS,
                 supports_check_mode = True,
             )