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The BIO created by OpenSSLBIOInputStream currently returns -1 and sets
the retry flag when read() returns zero on the underlying InputStream.
This is correct for “infinite” streams (like a socket), but isn't
correct for streams that have a definitive EOF.

This change adds a flag to OpenSSLBIOInputStream so that cases where the
input is finite (i.e. when parsing a PKCS#7 or X.509 block) can
correctly return 0 at EOF from |BIO_read|.

Bug: 21396526
Bug: 21209493
Change-Id: Iaad5845621ab8b89b42d5d3ca8e67e297278ca55