The script move the kamailio json files from /tmp/cfgtest folder
to the log folder as stated in the README file. This is executed
at the end of each single test.
To be sure that the /tmp/cfgtest is in place, it creates the folder
before start the test and it deletes the folder afterwards.
Change-Id: I54426b4415898165c1c2ba8154d0761a869c85d4