Reduce amount of time in gates

1) Remove boot_and_bounce soft_restart action. It takes about
   2 mintues to run soft delete. And this functionallity is already
   tested in gate-rally-dsvm-neutron. So remove it.

2) Reduce 10 times duration of test plugin ~10 sec -> ~1 second

3) Reduce amount of run of some benchmarks

4) Make concurency == times

Change-Id: Ic460b46f625c5cbeb1241c3e8d052506a32470a6