Get non-chunked input body filtering working with an EOS bucket. The

Get non-chunked input body filtering working with an EOS bucket.  The
basic design has ap_setup_client_block setting a field in the conn_rec
which tells http_filter how much data is in the body (with chunking this
will represent how much data is in the chunk).  The ap_get_client_block
then calls down the stack with the maximum amount of data that it can
receive back.  When http_filter reads all of the data, it adds an eos
bucket to the end of the brigade.  ap_get_client_block continues to read
data until it gets the eos bucket.  This allows filters to increase the
size of the body data.

git-svn-id: https://svn.apache.org/repos/asf/httpd/httpd/trunk@86586 13f79535-47bb-0310-9956-ffa450edef68