Doubled message "Environment was successfully reset"

[Kyrylo Romanenko]

Steps to reproduce:
1. Setup environment: nodes, networks, verify networks etc.
2. Start Deployment. Wait several minutes.
3. Stop deployment.
4. Reset Environment.
5. Wait until reset will perform to end.

Expected results:
One message "Environment was successfully reset"
Actual result:
Two messages:
"Environment was successfully reset
Environment was successfully reset"

Reproducibility:
After every reset of environment.

Impact:
Simple visual bug.

Description of the environment:
# shotgun2 short-report
cat /etc/fuel_build_id:
 143
cat /etc/fuel_build_number:
 143
cat /etc/fuel_release:
 9.0
cat /etc/fuel_openstack_version:
 mitaka-9.0
rpm -qa | egrep 'fuel|astute|network-checker|nailgun|packetary|shotgun':
 fuel-library9.0-9.0.0-1.mos8252.noarch
 fuel-agent-9.0.0-1.mos272.noarch
 nailgun-mcagents-9.0.0-1.mos732.noarch
 fuel-misc-9.0.0-1.mos8252.noarch
 shotgun-9.0.0-1.mos87.noarch
 python-packetary-9.0.0-1.mos129.noarch
 fuel-bootstrap-cli-9.0.0-1.mos272.noarch
 fuel-provisioning-scripts-9.0.0-1.mos8610.noarch
 fuel-mirror-9.0.0-1.mos129.noarch
 fuel-openstack-metadata-9.0.0-1.mos8610.noarch
 fuel-notify-9.0.0-1.mos8252.noarch
 fuel-ostf-9.0.0-1.mos920.noarch
 fuel-setup-9.0.0-1.mos6324.noarch
 python-fuelclient-9.0.0-1.mos301.noarch
 network-checker-9.0.0-1.mos72.x86_64
 fuel-9.0.0-1.mos6324.noarch
 fuel-utils-9.0.0-1.mos8252.noarch
 fuel-nailgun-9.0.0-1.mos8610.noarch
 fuel-release-9.0.0-1.mos6324.noarch
 rubygem-astute-9.0.0-1.mos732.noarch
 fuelmenu-9.0.0-1.mos263.noarch
 fuel-ui-9.0.0-1.mos2635.noarch
 fuel-migrate-9.0.0-1.mos8252.noarch