tests: Use a default of supports_cli=True (instead of supports_cli=False)

test/functional/test_framework/test_framework.py

@@ -97,7 +97,7 @@ class BitcoinTestFramework(metaclass=BitcoinTestMetaClass):
         self.nodes = []
         self.network_thread = None
         self.rpc_timeout = 60  # Wait for up to 60 seconds for the RPC server to respond
-        self.supports_cli = False
+        self.supports_cli = True
         self.bind_to_localhost_only = True
         self.set_test_params()
         self.parse_args()