Only use supported EC curves in crypto tests

Avoid hardcoding EC curve names in tests where it basically doesn't
matter which curve is used. Take one of the supported curbes instead.
Also, when testing ECDH key generation, skip unsupported curves.

These changes are to simplify dealing with exotic libcrypto builds
that don't support certain curves (for example RHEL disallows < 256
bit curves). The crypto application is only able to detect the
supported curves on a very coarse level (ECC support in general and
GF2m curves), so it may be necessary to edit the list of curves in the
crypto_ec_curves modules. But that should be the only necessary
modification to make the crypto tests pass.

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