Fix for NTPSec failing to synchronize (sonic-net#19444)

Description of PR
The PR contains fix for failed NTP testcases on Bookworm based PTF image. The NTPSec daemon on Bookworm has "tos minclock 4 minsane 3" configuration line which requires at least 4 clocks to be available before ntpstat reports synchronized status. Since we use local clock, the line is commented.

Applicable only to docker-ptf images that are based on Bookworm.

Summary:
Fixes # (issue)

Type of change
 Bug fix
 Testbed and Framework(new/improvement)
 New Test case
 Skipped for non-supported platforms
 Test case improvement

Approach
What is the motivation for this PR?
Fix NTP test failures.

How did you do it?
See description

How did you verify/test it?
Manually in VS test testbed.

Any platform specific information?
No

signed-off-by: jianquanye@microsoft.com

Author: opcoder0

tests/common/helpers/ntp_helper.py

@@ -40,6 +40,12 @@ def setup_ntp_context(ptfhost, duthost, ptf_use_ipv6):
     ptfhost.lineinfile(
         path=ntp_conf_path, line="#pool 3.debian.pool.ntp.org iburst", regexp="^pool.*3.debian.*pool.*ntp.*org.*")
 
+    # Comment out the tos minclock minsane option line
+    # Having this option enabled can cause the NTP server to not synchronize
+    # with the PTF host, which can lead to test failures.
+    ptfhost.lineinfile(
+        path=ntp_conf_path, line="#tos minclock 4 minsane 3", regexp="^tos.*minclock.*minsane.*")
+
     ptfhost.lineinfile(path=ntp_conf_path, line="server 127.127.1.0 prefer")
 
     # restart ntp server