backport from 2.1:

Use saner default config values for suexec.

PR: 15713
Submitted by: Thom May <thom@planetarytramp.net>


git-svn-id: https://svn.apache.org/repos/asf/httpd/httpd/branches/APACHE_2_0_BRANCH@98513 13f79535-47bb-0310-9956-ffa450edef68