Call duthost_console fixture for test_escape_character test case (#8733)

* Call duthost_console fixture for test_escape_character
* Fix for test_escape_character - dut_console

tests/dut_console/test_escape_character.py

@@ -1,24 +1,18 @@
-import pexpect
 import logging
-import time
-import re
 import pytest
-import six
 
-from tests.common.helpers.assertions import pytest_assert
 
 TOTAL_PACKETS = 100
+packet_number = 10
 logger = logging.getLogger(__name__)
 
 pytestmark = [
     pytest.mark.topology('any')
 ]
 
 
-def test_console_escape():
-    child = pexpect.spawn("ping 127.0.0.1 -c {} -i 1".format(TOTAL_PACKETS))
-    time.sleep(5)
-    child.sendcontrol('C')
-    child.expect(r"\^C")
-    match = re.search(r'(\d) packets transmitted', six.ensure_text(child.read()))
-    pytest_assert(int(match.group(1)) < TOTAL_PACKETS, "Escape Character does not work.")
+def test_console_escape(duthost_console):
+    duthost_console.send_command("ping 127.0.0.1 -c {} -i 1".format(TOTAL_PACKETS),
+                                 expect_string=r"icmp_seq={}".format(packet_number))
+    duthost_console.send_command("\x03",
+                                 expect_string=r"{} packets transmitted".format(packet_number), max_loops=300)