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/feature_block.py

@@ -75,9 +75,6 @@ class FullBlockTest(BitcoinTestFramework):
         self.setup_clean_chain = True
         self.extra_args = [[]]
 
-    def skip_test_if_missing_module(self):
-        self.skip_if_no_wallet()
-
     def run_test(self):
         node = self.nodes[0]  # convenience reference to the node