Set timezone and locale in Centos os image

Signed-off-by: Maria Shaldibina <mariash@pivotallabs.com>
Install ca-certificates on ubuntu os image

Signed-off-by: Maria Shaldibina <mariash@pivotallabs.com>
Allow to set swap memory limit in trusty

Setting swap memory limit is not enabled by default on
trusty.

Signed-off-by: Maria Shaldibina <mariash@pivotallabs.com>