test: Disable several (sub)tests with cli

Reason for each test:
rpc_whitelist.py: Relies on direct RPC calls
wallet_encryption.py: Null characters cannot be passed to suprocess.Popen
wallet_fundrawtransaction.py: multiple checks for wrong types, which have different error messages with cli
wallet_send.py: multiple checks for wrong types

test/functional/rpc_whitelist.py

@@ -33,6 +33,7 @@ class RPCWhitelistTest(BitcoinTestFramework):
 
     def set_test_params(self):
         self.num_nodes = 1
+        self.supports_cli = False
 
     def run_test(self):
         # 0 => Username