Gateway ping process should be moved from netconfig to connectivity checker

Fix proposed to branch: stable/mitaka
Review: https://review.openstack.org/371395

moved to 9.2 since it doesn't affect users directly.

Reviewed: https://review.openstack.org/371395
Committed: https://git.openstack.org/cgit/openstack/fuel-library/commit/?id=8cd083474fbfdd41dad14503ed952b101d2dcc94
Submitter: Jenkins
Branch: stable/mitaka

commit 8cd083474fbfdd41dad14503ed952b101d2dcc94
Author: Stanislaw Bogatkin <email address hidden>
Date: Wed Aug 31 17:24:58 2016 +0300

    Move gateway ping to connectivity tests

    Gateway ping is actually function of connectivity checker, not netconfig
    one, so it should be moved from there. Also it breaks the case when
    netconfig tasks ran on bootstrap node for network verification graph
    when there is no default gateway yet.

    Change-Id: I8c5fbd1b78eeb0abbae57c66a5b0c1d17b81fad2
    (cherry picked from commit 660d98018455aa53f56d1946a39be8fa1364f8a2)
    Closes-Bug: #1624288

Verification on 9.2 is postponed: waiting for fix https://review.openstack.org/#/c/410085/ is merged.

Verified on 9.2 snapshot #747.

Actual results:
Net-verification graph is executed successfully:

[root@nailgun ~]# ll /etc/fuel/graphs/
total 12
drwxr-xr-x. 2 root root 4096 Jan 11 12:51 deletion
drwxr-xr-x. 2 root root 4096 Jan 11 12:51 net-verification
drwxr-xr-x. 2 root root 4096 Jan 11 12:51 provision
[root@nailgun ~]# fuel2 graph upload -e 1 -t my_type -d /etc/fuel/graphs/net-verification/
Deployment graph was successfully uploaded.
[root@nailgun ~]# fuel2 graph execute -e 1 -t my_type
Deployment task with id 2 for the environment 1 has been started.

Deploy is finished successfully:
[root@nailgun ~]# fuel2 task list
+----+--------+------------+------------+---------+--------+---------+----------+
| id | status | name | graph_type | cluster | result | dry_run | progress |
+----+--------+------------+------------+---------+--------+---------+----------+
| 1 | ready | dump | None | None | {} | False | 100 |
| 2 | ready | deploy | None | 1 | {} | False | 100 |
| 3 | ready | deployment | my_type | 1 | {} | False | 100 |
+----+--------+------------+------------+---------+--------+---------+----------+