Merge bitcoin#15350: qa: Drop RPC connection if --usecli

6440e61 qa: Drop RPC connection if --usecli (João Barbosa)

Pull request description:

  Drop the RPC connection used in `TestNode.wait_for_rpc_connection` if `--usecli` is set. If the connection is kept and not used the `Connection: close` header is never sent and so the connection only closes due to timeout (30 sec).

  It might be sensible to revert e98a9ee in a follow up, however it changes the shutdown behavior.

Tree-SHA512: 2a8ee68b82ab612a556390aae521379e592c39ea0a7855a119282e6fe4cbf02ecafe7a5e2ee37d480f2c0600fa64791117a80fecc7bbe6bbb354107972b3b320

test/functional/test_framework/test_node.py

@@ -221,12 +221,15 @@ def wait_for_rpc_connection(self):
                 raise FailedToStartError(self._node_msg(
                     'dashd exited with status {} during initialization'.format(self.process.returncode)))
             try:
-                self.rpc = get_rpc_proxy(rpc_url(self.datadir, self.index, self.chain, self.rpchost), self.index, timeout=self.rpc_timeout, coveragedir=self.coverage_dir)
-                self.rpc.getblockcount()
+                rpc = get_rpc_proxy(rpc_url(self.datadir, self.index, self.chain, self.rpchost), self.index, timeout=self.rpc_timeout, coveragedir=self.coverage_dir)
+                rpc.getblockcount()
                 # If the call to getblockcount() succeeds then the RPC connection is up
+                self.log.debug("RPC successfully started")
+                if self.use_cli:
+                    return
+                self.rpc = rpc
                 self.rpc_connected = True
                 self.url = self.rpc.url
-                self.log.debug("RPC successfully started")
                 return
             except IOError as e:
                 if e.errno != errno.ECONNREFUSED:  # Port not yet open?