Refactor RandomSalt to handle salts of different lengths.

All we need is 4 bytes at the moment, for MD5 authentication. But in
upcomint patches for SCRAM authentication, SCRAM will need a salt of
different length. It's less scary for the caller to pass the buffer
length anyway, than assume a certain-sized output buffer.

Author: Michael Paquier
Discussion: <cab7npqqvo4sxlfes9d+nm3wpy08iezdaj_6e117mqhzafxb...@mail.gmail.com>

Branch
------
master

Details
-------
http://git.postgresql.org/pg/commitdiff/fa878703f456b804b01b61a9d94008f57967cdd0

Modified Files
--------------
src/backend/postmaster/postmaster.c | 20 +++++++++-----------
1 file changed, 9 insertions(+), 11 deletions(-)


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