Specify stemcell os name for ci-box-bats

Signed-off-by: Maria Shaldibina <mshaldibina@pivotal.io>
Specify stemcell os name for ci-aws-bats

Signed-off-by: Maria Shaldibina <mshaldibina@pivotal.io>
Set permissions on ~/.ssh and authorized_keys

Signed-off-by: Maria Shaldibina <mshaldibina@pivotal.io>
Set /vagrant to 775

Signed-off-by: Maria Shaldibina <mshaldibina@pivotal.io>