Use the latest openvpn-bosh-release version
Use the latest openvpn-bosh-release version

- update the key_usage block for the server cert to allow mutual TLS
authentication

[#164386432](https://www.pivotaltracker.com/story/show/164386432)

Co-authored-by: Paul Warren <381ebbe39e97b92332c450533d9eabb9a873db86@emc.com>

dpb587/openvpn-boshrelease,dpb587/openvpn-bosh-release,dpb587/openvpn-bosh-release,dpb587/openvpn-boshrelease,dpb587/openvpn-bosh-release