Increase timeout in gdbclientutils.py to decrease chance of test failing under ASAN.

llvm-svn: 374371
(cherry picked from commit cba575e)

Author: adrian-prantl

lldb/packages/Python/lldbsuite/test/functionalities/gdb_remote_client/gdbclientutils.py

@@ -298,7 +298,7 @@ def _run(self):
         try:
             # accept() is stubborn and won't fail even when the socket is
             # shutdown, so we'll use a timeout
-            self._socket.settimeout(2.0)
+            self._socket.settimeout(20.0)
             client, client_addr = self._socket.accept()
             self._client = client
             # The connected client inherits its timeout from self._socket,