tests: Apply --timeoutscale option to rpc timeouts (#3982)

test/functional/test_framework/test_node.py

@@ -26,6 +26,7 @@ from .util import (
     wait_until,
     p2p_port,
     get_chain_folder,
+    Options
 )
 
 # For Python 3.4 compatibility
@@ -62,6 +63,7 @@ class TestNode():
         else:
             # Wait for up to 60 seconds for the RPC server to respond
             self.rpc_timeout = 60
+        self.rpc_timeout *= Options.timeout_scale
         self.binary = bitcoind
         self.stderr = stderr
         self.coverage_dir = coverage_dir