query_unittest: Fix argument to set()
query_unittest: Fix argument to set()

Commit e431074f introduced an uncatched bug. This patch fixes this. The
set is expecting a list or iteratable to work on, so it splitted the
provided instance name into a set of characters. This caused the
exp_status never been set and therefore not catched in one assert rule
further below who checks that every status was tested.

Signed-off-by: René Nussbaumer <bc755ac45a0e799d1d490cba76febc56d80cc5fc@google.com>
Reviewed-by: Michael Hanselmann <68b67885ff74281219b4a4be33cc20fd45078d7c@google.com>

onponomarev/ganeti,mbakke/ganeti,onponomarev/ganeti,yiannist/ganeti,ganeti-github-testing/ganeti-test-1,andir/ganeti,yiannist/ganeti,dimara/ganeti,apyrgio/snf-ganeti,apyrgio/ganeti,leshchevds/ganeti,mbakke/ganeti,andir/ganeti,bitemyapp/ganeti,andir/ganeti,leshchevds/ganeti,yiannist/ganeti,bitemyapp/ganeti,apyrgio/snf-ganeti,mbakke/ganeti,dimara/ganeti,ganeti/ganeti,ganeti-github-testing/ganeti-test-1,apyrgio/ganeti,ganeti/ganeti,ganeti/ganeti,grnet/snf-ganeti,leshchevds/ganeti,grnet/snf-ganeti