This patch fixes access_processor to parse request path correctly
when the request path includes query with slash delimiters.
For example, existing access_processor's result of log line
with a request path "/v1/acc/con?prefix=YYYY/MM/DD" is as follows:
account = "acc"
container_name = "con"
object_name = "MM/DD"
It is because, existing access_processor splits query from request paths
*AFTER* splits them into account, container_name, object_name.
This patch changes splitting query timing.
b973f522b8