Merge r629159, r629164, r629218, r630139 from trunk:

Improve salt string generation.

Submited by: Andreas Krennmair <ak synflood.at>

Improve generation of the seed to rand, by using apr_generate_random_bytes, 
rather than the current time as a seed.

Fix printing of error message.

* support/htpasswd.c (seed_rand): Fix compiler warning.

PR: 31440
Reviewed by: rpluem, jim, pquerna


git-svn-id: https://svn.apache.org/repos/asf/httpd/httpd/branches/2.2.x@662572 13f79535-47bb-0310-9956-ffa450edef68