Make sure that stunnel restarts when cert/key change (#6181)

Change-Id: I5085247a87018e18e73833119ac73225afbfea1e
Make sure openvpn is restarted when cert/key change (#6405)

I reformatted the section below for consistency.

Change-Id: I18f5e23850e0c1ab4b1f2ee467d5af54ae9ff303