pybatfish: delete everything deprecated

[dhalperi]

Stack:

• 913

• 912

• 911 ⬅

⚠️ Part of a stack created by spr. Do not merge manually using the UI - doing so may have unexpected results.

[batfish-bot]

This change is 

[codecov[bot]]

Codecov Report

All modified and coverable lines are covered by tests :white_check_mark:

Project coverage is 87.07%. Comparing base (4648ff8) to head (cd0fd1f).

Additional details and impacted files

```diff @@ Coverage Diff @@ ## master #911 +/- ## ========================================== + Coverage 87.00% 87.07% +0.07% ========================================== Files 24 24 Lines 3654 3551 -103 Branches 770 716 -54 ========================================== - Hits 3179 3092 -87 + Misses 339 329 -10 + Partials 136 130 -6 ``` | [Files](https://app.codecov.io/gh/batfish/pybatfish/pull/911?dropdown=coverage&src=pr&el=tree&utm_medium=referral&utm_source=github&utm_content=comment&utm_campaign=pr+comments&utm_term=batfish) | Coverage Δ | | |---|---|---| | [pybatfish/client/restv2helper.py](https://app.codecov.io/gh/batfish/pybatfish/pull/911?src=pr&el=tree&filepath=pybatfish%2Fclient%2Frestv2helper.py&utm_medium=referral&utm_source=github&utm_content=comment&utm_campaign=pr+comments&utm_term=batfish#diff-cHliYXRmaXNoL2NsaWVudC9yZXN0djJoZWxwZXIucHk=) | `67.18% <100.00%> (-1.50%)` | :arrow_down: | | [pybatfish/client/session.py](https://app.codecov.io/gh/batfish/pybatfish/pull/911?src=pr&el=tree&filepath=pybatfish%2Fclient%2Fsession.py&utm_medium=referral&utm_source=github&utm_content=comment&utm_campaign=pr+comments&utm_term=batfish#diff-cHliYXRmaXNoL2NsaWVudC9zZXNzaW9uLnB5) | `82.28% <ø> (+1.17%)` | :arrow_up: | | [pybatfish/datamodel/referencelibrary.py](https://app.codecov.io/gh/batfish/pybatfish/pull/911?src=pr&el=tree&filepath=pybatfish%2Fdatamodel%2Freferencelibrary.py&utm_medium=referral&utm_source=github&utm_content=comment&utm_campaign=pr+comments&utm_term=batfish#diff-cHliYXRmaXNoL2RhdGFtb2RlbC9yZWZlcmVuY2VsaWJyYXJ5LnB5) | `100.00% <ø> (+1.86%)` | :arrow_up: |