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/wallet_send.py

@@ -29,6 +29,7 @@ class WalletSendTest(BitcoinTestFramework):
         self.num_nodes = 2
         # whitelist peers to speed up tx relay / mempool sync
         self.noban_tx_relay = True
+        self.supports_cli = False
         self.extra_args = [
             ["-walletrbf=1"],
             ["-walletrbf=1"]