Add idempotency when stopping a VM and some tests

When deleting a VM, we try to force stop it. If the VM is already stopped,
LXD will return an error. Unfortunately, we can't import the drivers package
from LXD without also pulling in a bunch of linux specific CGO dependencies
which we want to avoid.

Signed-off-by: Gabriel Adrian Samfira <gsamfira@cloudbasesolutions.com>

database/sql/util.go

@@ -76,6 +76,10 @@ func (s *sqlDatabase) sqlToCommonOrganization(org Organization) params.Organizat
 		Pools:           make([]params.Pool, len(org.Pools)),
 	}
 
+	for idx, pool := range org.Pools {
+		ret.Pools[idx] = s.sqlToCommonPool(pool)
+	}
+
 	return ret
 }