Add export of external ntp, dns to acceptance tests

[Andrey Sledzinskiy]

In next threads we need to have exports like:
export EXTERNAL_DNS="8.8.4.4, 172.18.80.136"
export EXTERNAL_NTP="ntp4.stratum2.ru, 2.pool.ntp.org"

Threads:
ha_tun_group_1
ha_tun_group_3
ha_vlan_group_5
ha_vlan_group_6
ha_vlan_group_7

[Fuel Devops McRobotson (fuel-devops-robot)]

Fix proposed to branch: master
Change author: Vasily Gorin <email address hidden>
Review: https://review.fuel-infra.org/16257

[Fuel Devops McRobotson (fuel-devops-robot)]

Reviewed: https://review.fuel-infra.org/16257
Submitter: Dmitry Kaigarodsev <email address hidden>
Branch: master

Commit: 141bcbf20b48818593b0650d2a560abb23f8ffa2
Author: Vasily Gorin <email address hidden>
Date: Fri Jan 29 11:28:54 2016

Add export of external ntp, dns to acceptance tests
Rename template and job name for thread_separate_services_ceph
Group testgroups under one template in acceptance.test.yaml
Closes-Bug: #1535302

Change-Id: I4187d26b0762860cc31f1dee6efd90a1a5ce20fc