Merge pull request riscv-software-src#509 from riscv-software-src/int…

…erlock

debug: Better interlock when interacting with gdb CLI.

debug/testlib.py

@@ -796,6 +796,7 @@ def command(self, command, ops=1, reset_delays=0):
         timeout = max(1, ops) * self.timeout
         self.active_child.sendline(command)
         try:
+            self.active_child.expect(re.escape(command), timeout=timeout)
             self.active_child.expect("\n", timeout=timeout)
         except pexpect.exceptions.TIMEOUT as exc:
             raise CommandSendTimeout(command) from exc