Be more pedantic when cleaning environment. Clean it

immediately after startup.

PR: 2790, 10449
Submitted by: Jeff Stewart <jws@purdue.edu>


git-svn-id: https://svn.apache.org/repos/asf/httpd/httpd/branches/APACHE_2_0_BRANCH@98760 13f79535-47bb-0310-9956-ffa450edef68