libcrypto: extend verify and callback regress

Add three more test variants for scenario 2a:

1) verify that a chain of length 3 validates with depth 2.
2) verify that a chain of length 3 fails to validate with depth 1.
3) verify that a chain of length 3 validates with depth 1 if we
   allow the callback to override the depth.

Variant 3) fails in -current and reproduces a scenario reported
by kirill.

Also add two test variants for the scenarios in 14:

4): run the chain of length 32 with a yolo callback returning 1
5): run the chain of length 33 with a yolo callback returning 1

Test 5) fails because we currently bail out at the wrong depth.
The verify callback should allow overriding the failure and will
then hit the bounds check added in x509_verify.c r1.74 to avoid
an overwrite.

Reuse the existing test cases 2a and 14a/14b for this and add an
optional vct->desc that uniquely identifies the test case.

incorporates various feedback from jsing

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