MFH: r537129
security/openvpn: cherry-pick fixes from git repo
- 098edbb1 2020-05-20 | Switch assertion failure to returning false [Jeremy Evans]
- fc029714 2020-05-30 | pool: prevent IPv6 pools to be larger than 2^16 addresses [Antonio Quartulli]
- 38b46e6b 2020-02-20 | Persist management-query-remote and proxy prompts [Selva Nair]
Approved by: ports-secteam (blanket approval for stability fixes)