poc: Move test vector generation out of unit tests

Remove the TEST_VECTOR and TEST_VECTOR_PATH environment variables and
move test vector generation logic into a new tool, `gen_test_vec.py`.

The test vectors are complete with the following exceptions:

1. We currently don't have test vectors for Prio3MultihotCountVec. This
   VDAF is new as of draft 10, but we neglected to add test vectors for
   it. This change checks in the test vectors.

2. The test vector for IdpfBBCGGI21 was regenerated after this IDPF was
   renamed. Also, as of 01291c2, we are
   generating this with a proper nonce rather than an adhoc binder. To
   confirm that nothing has changed, you can modify
   `gen_test_vec_for_idpf()` by replacing Lines

    ```
    nonce = gen_rand(idpf.NONCE_SIZE)
    ```

    with

    ```
    nonce = bytes([0x73,0x6f,0x6d,0x65,0x20,0x6e,0x6f,0x6e,0x63,0x65])
    ```

Also, this change opts in `gen_test_vec.py` and
`plot_prio3_multiproof_robustness.py` into linting and type checking.

.github/workflows/lint-python.yml

@@ -25,16 +25,16 @@ jobs:
 
     - name: Run pyflakes
       working-directory: poc
-      run: pyflakes vdaf_poc/*.py tests/*.py
+      run: pyflakes *.py vdaf_poc/*.py tests/*.py
 
     - name: Run autopep8
       working-directory: poc
-      run: autopep8 --diff --exit-code vdaf_poc/*.py tests/*.py
+      run: autopep8 --diff --exit-code *.py vdaf_poc/*.py tests/*.py
 
     - name: Run isort
       working-directory: poc
       run: isort --check .
 
     - name: Run pylint
       working-directory: poc
-      run: pylint --disable=all --enable=redefined-outer-name vdaf_poc/*.py tests/*.py
+      run: pylint --disable=all --enable=redefined-outer-name *.py vdaf_poc/*.py tests/*.py

.github/workflows/test.yml

@@ -32,4 +32,4 @@ jobs:
 
     - name: Enforce type hints
       working-directory: poc
-      run: sage -python -m mypy vdaf_poc/*.py tests/*.py
+      run: sage -python -m mypy *.py vdaf_poc/*.py tests/*.py

poc/README.md

@@ -38,17 +38,15 @@ sage -python -m unittest
 
 ## Generating test vectors
 
-To generate test vectors, set environment variable `TEST_VECTOR` to
-be `TRUE` when running tests:
+To generate test vectors, run:
 
 ```
-TEST_VECTOR=TRUE sage -python -m unittest --quiet
+sage -python gen_test_vec.py
 ```
 
 Users can also specify a custom path to generate the test vectors in
-environment variable `TEST_VECTOR_PATH`. For example, to generate
-test vectors for Prio3 VDAFs into path `test_vec/00`:
+environment variable `TEST_VECTOR_PATH`:
 
 ```
-TEST_VECTOR=TRUE TEST_VECTOR_PATH=test_vec/00 sage -python -m unittest --quiet tests/test_vdaf_prio3.py
+TEST_VECTOR_PATH=path/to/test_vec sage -python gen_test_vec.py
 ```