Avoid over allocation when dealing with the common case. As stated in the...

Avoid over allocation when dealing with the common case. As stated in the comment above : "We'll assume the common case where one bucket is enough".

Doing so should save a few hundreds bytes in the 'request' pool when processing a request

git-svn-id: https://svn.apache.org/repos/asf/httpd/httpd/trunk@1483005 13f79535-47bb-0310-9956-ffa450edef68