Remove superfluous crypto/bio dependencies from tests.

Limiting uses of crypto/bio to code that really need to it by avoiding
the use of BIO just to write to stdout/stderr.

Change-Id: I34e0f773161aeec073691e439ac353fb7b1785f3
Reviewed-on: https://boringssl-review.googlesource.com/3930
Reviewed-by: Adam Langley <agl@google.com>
4 files changed