Add state_path config option

Some tests run and mount files to docker containers, like
scenario dynamic routing. Since we are running tempest in
container the path to child container should be present on
the host (docker starting container from the system).
Right now path is hardcoded to /tmp/ directory. This config
option is needed for that case.

Related-Prod: PRODX-31417
Change-Id: I9d9772c526a5d383ef14d0c9247b7ecdc63957fc
1 file changed