Fix a mismatch of data types: apr_time_t vs intervals measured

in seconds.  Also use 64-bit atoi conversions to avoid loss of
precision (thanks to Paul Reder for the atoi fix)


git-svn-id: https://svn.apache.org/repos/asf/httpd/httpd/trunk@97186 13f79535-47bb-0310-9956-ffa450edef68