Fix compression param in the spec file
Fix compression param in the spec file

When attempting to specify `lz4-2` OpenVPN would fail to start with unknown compression options, changing to `lz4-v2` resolves this.
dpb587/openvpn-bosh-release,dpb587/openvpn-bosh-release,dpb587/openvpn-bosh-release,dpb587/openvpn-boshrelease,dpb587/openvpn-boshrelease