Sometimes there are issues that are hard to catch, but which only occur
for a certain REST requests. In this case it is convenient if tracing
for these requests can be enabled by configuration.
It is now possible to configure a regular expression for a request URI
to trigger automatic tracing for matching REST requests.
Change-Id: I264c75259fe1f254fed059bfaa3767af407546f1
Signed-off-by: Edwin Kempin <ekempin@google.com>