security/strongswan: enable options to increase usefulness of default pkg

• Enable PKI, SWANCTL, and VICI options (no external dependencies)
• Document IMPLIES dependency on VICI for SWANCTL; mention in SWANCTL_DESC
• Bump PORTREVISION

PR: 205438
Reported by: Nick B <nicblais@clkroot.net>
Submitted by: strongswan@Nanoteq.com (maintainer)