*) Add apr_bucket_setaside_noop to use for buckets that do not require a

*) Add apr_bucket_setaside_noop to use for buckets that do not require a
   setaside function. It simply returns APR_SUCCESS.
   - adjust the EOS, FLUSH, IMMORTAL, and HEAP buckets to use _noop.

*) Make the setaside() function take a pool to define the (new) lifetime for
   the bucket's data.
   - Adjust the apr_bucket_setaside() macro.
   - Adjust the apr_bucket_setaside_notimpl() and transient_setaside()
     functions.
   - Pass the additional parameter in ap_save_brigade()

*) Update docs for setaside()

*) Minor nit with macros in apr_buckets.h: add parens for binding safety.

git-svn-id: https://svn.apache.org/repos/asf/httpd/httpd/trunk@89289 13f79535-47bb-0310-9956-ffa450edef68