* Add SCRAM_DIGEST_SIZE macro for maximum possible digest size. It will
avoid new buffer overflow errors when new digests are added.
* Fix buffer overflow in sasl_scram(). Buffers were allocated for SHA1
digest size.
* Fix bug with handler re-registration when a SASL SCRAM mechanism
fails.
@sjaeckel integrated clang-format with formal coding style. Run his
script and commit changes.
There are pros and cons of this commit.
Mixed coding style is a "broken window". A good single style simplifies
reading and writing code.
On the other hand, this is a big change which will lead to conflicts.
Passing an array as a parameter to a function in C doesn't work, they decay
into pointer. Defining them is pointless and error prone, so just
declare a pointer.
