BUG/MINOR: proto_http: properly reset the stream's call rate on keep-alive

The stream's call rate measurement was added by commit 2e9c1d296 ("MINOR:
stream: measure and report a stream's call rate in "show sess"") but it
forgot to reset it in case of HTTP keep-alive (legacy mode), resulting
in incorrect measurements.

No backport is needed, unless the patch above is backported.
1 file changed