Limit and document Blowfish key lengths to 8-576 bits
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Description

Limit and document Blowfish key lengths to 8-576 bits

* cipher/blowfish.c (BLOWFISH_KEY_MIN_BITS)
(BLOWFISH_KEY_MAX_BITS): New.
(do_bf_setkey): Check input key length to MIN_BITS and MAX_BITS.
* doc/gcrypt.texi: Update supported Blowfish key lengths.
* tests/basic.c (check_ecb_cipher): New, with Blowfish test vectors
for different key lengths.
(check_cipher_modes): Call 'check_ecb_cipher'.

As noted by Peter Wu, Blowfish cipher implementation already supports key
lengths 8 to 576 bits [1]. This change updates documentation to reflect
that and adds new test vectors to check handling of different key lengths.

[1] https://lists.gnupg.org/pipermail/gcrypt-devel/2019-April/004680.html