Reset normal search fields after tests

Made `test_host_analysis` fail because the active search blocked out some of the hosts for good.
Possible issues in VMs are fixed as well (haven't looked into the tests in that section so not sure if it's actually causing any problems or not).

To see fail X success, run **py.test -k "advanced_search and host or host_analysis" --use-provider=vsphere55** on master X this branch.