refactor in preparation for differential push

Signed-off-by: Damien Le Berrigaud <damien@pivotallabs.com>
basics for differential push
[#56843264]

Signed-off-by: Ted Young <tyoung@pivotallabs.com>
do not show body in CF_TRACE for multipart/form requests

Signed-off-by: Ted Young <tyoung@pivotallabs.com>