[tacacs] Remove useless params in test_ro_disk (#7584)

What is the motivation for this PR?
There are useless params in function do_reboot()

How did you do it?
Remove useless params in do_reboot()

How did you verify/test it?
Run tests

Signed-off-by: Yaqiang Zhu <[email protected]>

tests/tacacs/test_ro_disk.py

@@ -46,7 +46,7 @@ def chk_ssh_remote_run(localhost, remote_ip, username, password, cmd):
     return rc == 0
 
 
-def do_reboot(duthost, localhost, duthosts, rw_user="", rw_pass=""):
+def do_reboot(duthost, localhost, duthosts):
     # occasionally reboot command fails with some kernel error messages
     # Hence retry if needed.
     #
@@ -213,6 +213,6 @@ def test_ro_disk(localhost, ptfhost, duthosts, enum_rand_one_per_hwsku_hostname,
     finally:
         logger.debug("START: reboot {} to restore disk RW state".
                 format(enum_rand_one_per_hwsku_hostname))
-        do_reboot(duthost, localhost, duthosts, rw_user, rw_pass)
+        do_reboot(duthost, localhost, duthosts)
         logger.debug("  END: reboot {} to restore disk RW state".
                 format(enum_rand_one_per_hwsku_hostname))