test: remove legacy wallet functional tests

Removes all legacy wallet specific functional tests.

Also removes the --descriptor and --legacy-wallet options as these are
no longer necessary with the legacy wallet removed.

test/functional/wallet_descriptor.py

@@ -23,9 +23,6 @@ from test_framework.wallet_util import WalletUnlock
 
 
 class WalletDescriptorTest(BitcoinTestFramework):
-    def add_options(self, parser):
-        self.add_wallet_options(parser, legacy=False)
-
     def set_test_params(self):
         self.setup_clean_chain = True
         self.num_nodes = 1
@@ -72,15 +69,6 @@ class WalletDescriptorTest(BitcoinTestFramework):
         assert_equal(cache_records, 1000)
 
     def run_test(self):
-        if self.is_bdb_compiled():
-            # Make a legacy wallet and check it is BDB
-            self.nodes[0].createwallet(wallet_name="legacy1", descriptors=False)
-            wallet_info = self.nodes[0].getwalletinfo()
-            assert_equal(wallet_info['format'], 'bdb')
-            self.nodes[0].unloadwallet("legacy1")
-        else:
-            self.log.warning("Skipping BDB test")
-
         # Make a descriptor wallet
         self.log.info("Making a descriptor wallet")
         self.nodes[0].createwallet(wallet_name="desc1", descriptors=True)