fix(agw): Fixed integ test python syntx warning

[VinashakAnkitAman]

Title

fix(agw): Fixed integ test python syntax warning

Summary

On latest master, a warning is thrown for every test case for wrong python syntax during comparison of byte string. This PR fixes the python syntax warning in CI.

Following is the warning:

/home/vagrant/magma/lte/gateway/python/integ_tests/s1aptests/util/traffic_messages.py:149: SyntaxWarning: "is not" with a literal. Did you mean "!="?
  if len(length) and length is not b'0':

Test plan

Verified with sanity

Signed-off-by: VinashakAnkitAman ankit.aman@radisys.com

[github-actions]

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[mpfirrmann]

This code change is already part of #12938

[github-actions]

feg-workflow

    2 files  203 suites   38s ⏱️
371 tests 371 ✔️ 0 💤 0 ❌
385 runs  385 ✔️ 0 💤 0 ❌

Results for commit 0ea35fe.

♻️ This comment has been updated with latest results.

[github-actions]

dp-workflow

18 tests   18 ✔️  4m 54s ⏱️
  2 suites    0 💤
  2 files      0 ❌

Results for commit 0ea35fe.

♻️ This comment has been updated with latest results.

[github-actions]

agw-workflow

     79 files     124 suites   6m 41s ⏱️
1 153 tests 1 149 ✔️ 4 💤 0 ❌
1 155 runs  1 151 ✔️ 4 💤 0 ❌

Results for commit 0ea35fe.

♻️ This comment has been updated with latest results.

[pruthvihebbani]

lgtm

[pruthvihebbani]

lte test job is failing. Can you check