fix(agw): Provides the fixes for the issue #12364

[rsarwad]

Signed-off-by: Rashmi rashmi.sarwad@radisys.com

Summary

Modified code to

1. Fixes the issue, grpc_async_service_thread : Fatal Error: SIGABRT / SI_TKILL in Non-Nat #12364
2. Stop the async grpc server as part of itti task termination
3. During completion queue shutdown, pop out all messages from completion queue and free the allocated resources

Test Plan

Executed s1ap sanity test suite, unit test cases and s6a test cases in Teravm setup configured for both NAT enabled and disabled

[github-actions]

Thanks for opening a PR! 💯

A couple initial guidelines

• All commits must be signed off. This is enforced by DCO check.
• All PR titles must follow the semantic commits format. This is enforced by Semantic PR.

Howto

• Reviews. The "Reviewers" listed for this PR are the Magma maintainers who will shepherd it.
• Checks. All required CI checks must pass before merge.
• Merge. Once approved and passing CI checks, use the ready2merge label to indicate the maintainers can merge your PR.

More info

Please take a moment to read through the Magma project's

• Contributing Conventions for norms around contributed code

If this is your first Magma PR, also consider reading

• Developer Onboarding for onboarding as a new Magma developer
• Development Workflow for guidance on your first pull request
• CI Checks for points of contact for failing or flaky CI checks
• GitHub-to-Slack mappings for Magma maintainers for guidance on how to contact maintainers on Slack

[github-actions]

feg-workflow

    2 files  202 suites   38s ⏱️
370 tests 370 ✔️ 0 💤 0 ❌
384 runs  384 ✔️ 0 💤 0 ❌

Results for commit 70900fb.

♻️ This comment has been updated with latest results.

[github-actions]

agw-workflow

     77 files     122 suites   7m 18s ⏱️
1 149 tests 1 140 ✔️ 9 💤 0 ❌
1 150 runs  1 141 ✔️ 9 💤 0 ❌

Results for commit 70900fb.

♻️ This comment has been updated with latest results.

[ssanadhya]

Lgtm