Check for comments in sai.profile lines in the test_link_local_ip.py (sonic-net#19989)

* Check the sai.profile lines for comments.

* Add to check for space before the # sign.

Author: rraghav-cisco

tests/ip/link_local/test_link_local_ip.py

@@ -61,8 +61,10 @@ def check_if_test_is_supported(duthost):
         sai_settings = {}
         sai_profile = "/usr/share/sonic/device/{}/{}/sai.profile".format(platform, hwsku)
         for line in duthost.command("cat %s" % sai_profile)["stdout_lines"]:
-            key, value = line.split("=")
-            sai_settings[key] = value
+            if (not re.match("^[ \t]*#", line)) and re.search("=", line):
+                # line should not a comment, and must contain the "=".
+                key, value = line.split("=")
+                sai_settings[key] = value
         if int(sai_settings.get("SAI_NOT_DROP_SIP_DIP_LINK_LOCAL", 0)) != 1:
             pytest.skip("Test is not supported, SAI_NOT_DROP_SIP_DIP_LINK_LOCAL is not equal 1 or not specified")