Add translation support to service and missed modules

Added translations to files:
 * sahara/service/ops.py
 * sahara/service/periodic.py
 * sahara/service/validation.py
 * sahara/service/validations/base.py
 * sahara/service/validations/cluster_templates.py
 * sahara/service/validations/clusters.py
 * sahara/service/validations/clusters_scaling.py
 * sahara/service/validations/node_group_templates.py
 * sahara/service/validations/plugins.py
 * sahara/swift/swift_helper.py
 * sahara/tests/unit/service/test_instances.py
 * sahara/topology/topology_helper.py
 * sahara/utils/api.py
 * sahara/utils/openstack/heat.py
 * sahara/utils/rpc.py
 * sahara/utils/ssh_remote.py
 * sahara/utils/timing.py
 * sahara/utils/types.py
 * tox.ini

Change-Id: Ic389ec768e7f70ea2c2ffbf77d46bbebdf94348a
Merge "Add translation support to service and missed modules"