Revision 239592

Merge r219635, r219667, r239390, r239574 from trunk:

* user/unix/userinfo.c (getpwnam_safe, apr_uid_name_get): Fix error
handling; always use the getpwnam_r return value as the error code,
and ignore errno, since POSIX does not require that getpwnam_r sets
errno.

* user/unix/groupinfo.c (apr_gid_name_get, apr_gid_get): Fix error
handling as above; and check for the NULL -> "no entry" cases here
too.

* test/testuser.c (fail_userinfo): Add test cases for error handling
(only one of them actually trips on the bugs in the old code with
glibc).

* user/unix/userinfo.c (getpwnam_safe, apr_uid_name_get): Fix error
handling for platforms which do not set errno on non-threadsafe
get{pw,gr}* failures; always return APR_ENOENT for that case.

* user/unix/groupinfo.c (apr_gid_name_get, apr_gid_get): Likewise.

PR: 34053
Submitted by: pquerna, jorton