server status remained in unexpected state

Two test case in the test_servers_negative change the 'one' servers
into a stable not active state. We are waiting 2 times 400 sec for
getting active state in vain.
Having those test cases to restore the expected state.

The deleted server related rebuild and reboot test case create are
merged and it creates and deletes one server.

Change-Id: Ie1b9dc62bad2bf7b8595da2c9d6f994c646a0025