chore(agw): Tidy up fabfile

[voisey]

Summary

Removes unused code found when looking at the AGW fabfile.

Test Plan

• Check 'LTE integ test' still runs: https://github.com/voisey/magma/actions/runs/3014235096
• Check 'LTE integ test bazel' still runs: https://github.com/voisey/magma/runs/8246843394

The workflows are failing on master, hence the above runs are not green.

[github-actions]

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[github-actions]

feg-workflow

    2 files  203 suites   40s ⏱️
374 tests 374 ✔️ 0 💤 0 ❌
388 runs  388 ✔️ 0 💤 0 ❌

Results for commit b7d164c.

♻️ This comment has been updated with latest results.

[github-actions]

dp-workflow

14 tests   14 ✔️  2m 26s ⏱️
  1 suites    0 💤
  1 files      0 ❌

Results for commit b7d164c.

♻️ This comment has been updated with latest results.

[github-actions]

agw-workflow

615 tests   611 ✔️  3m 54s ⏱️
    2 suites      4 💤
    2 files        0 ❌

Results for commit b7d164c.

♻️ This comment has been updated with latest results.

[mpfirrmann]

LGTM

[LKreutzer]

Lgtm, thanks for the clean up!