ssh/config permissions are 664 currently, causing error
`Bad owner or permissions on /home/jenkins/.ssh/config`

http://logs.openstack.org/68/461368/1/check/gate-kolla-ansible-dsvm-deploy-centos-binary-centos-7-nv/0a94da7/console.html#_2017-05-01_12_06_08_440775

config file should only be writen by owner.

Closes-Bug: #1687408
Change-Id: Id804f11a91858fa297e5236beb2110e3511eabec