increase crypto_unittest key sizes to satisfy NSS 3.19.1

NSS version 3.19.1 added minimum key size constraints to avoid the Logjam attack:

> The minimum size of keys that NSS will generate has been raised:
>    The minimum modulus size for RSA keys is now 512 bits
>    The minimum modulus size for DSA keys is now 1023 bits
>    The minimum modulus size for Diffie-Hellman keys is now 1023 bits

https://developer.mozilla.org/en-US/docs/Mozilla/Projects/NSS/NSS_3.19.1_release_notes

https://bugzilla.mozilla.org/show_bug.cgi?id=1138554

BUG=490240

Review URL: https://codereview.chromium.org/1148193006

Cr-Commit-Position: refs/heads/master@{#333554}
2 files changed