Description of problem:
Alerts regarding to volume status change should have unified reported values. When I receive notification about volume status change containing degraded or partial status I see this value in brackets but values up and down in these notifications are without brackets.

Version-Release number of selected component (if applicable):
tendrl-node-agent-1.5.4-8.el7rhgs.noarch
tendrl-notifier-1.5.4-5.el7rhgs.noarch
tendrl-selinux-1.5.4-1.el7rhgs.noarch
tendrl-commons-1.5.4-5.el7rhgs.noarch
tendrl-api-1.5.4-3.el7rhgs.noarch
tendrl-api-httpd-1.5.4-3.el7rhgs.noarch
tendrl-monitoring-integration-1.5.4-8.el7rhgs.noarch
tendrl-grafana-selinux-1.5.4-1.el7rhgs.noarch
tendrl-ansible-1.5.4-2.el7rhgs.noarch
tendrl-ui-1.5.4-4.el7rhgs.noarch
tendrl-grafana-plugins-1.5.4-8.el7rhgs.noarch

How reproducible:
100%

Steps to Reproduce:
1. Import cluster with disperse volume into tendrl.
2. Ensure that tendrl user has valid mail and enabled notifications.
3. Mount volume on client.
4. Start checking snmp messages:
# journalctl -u snmptrapd -fe
5. Start disconnecting hosts and wait after each change is in grafana.
6. Disconnect enough hosts so the volume becomes `Degraded` and after that `Partial`
6. Check for mails.
7. Check alerts in tendrl.

Actual results:
I receive notifications like these:
``[Tendrl Alert] Volume State, WARNING: status changed-State of volume: volume_gama_disperse_4_plus_2x2 changed from (degraded) to (partial)``
``[Tendrl Alert] Volume State, WARNING: status changed-State of volume: volume_gama_disperse_4_plus_2x2 changed from up to (degraded)``

Expected results:
``[Tendrl Alert] Volume State, WARNING: status changed-State of volume: volume_gama_disperse_4_plus_2x2 changed from degraded to partial``
``[Tendrl Alert] Volume State, WARNING: status changed-State of volume: volume_gama_disperse_4_plus_2x2 changed from up to degraded``

Additional info: