Changed functional tests which do not require wallets to run without

skipping  .Addreses #14216. Changed get_deterministic_priv_key() to a

named tuple

test/functional/example_test.py

@@ -85,6 +85,8 @@ class ExampleTest(BitcoinTestFramework):
 
         # self.log.info("I've finished set_test_params")  # Oops! Can't run self.log before run_test()
 
+    # Use skip_test_if_missing_module() to skip the test if your test requires certain modules to be present.
+    # This test uses generate which requires wallet to be compiled
     def skip_test_if_missing_module(self):
         self.skip_if_no_wallet()