net-mgmt/unifi-lts: Deprecate and expire

This LTS release was the last branch to support UAP-AC, UAP-AC v2,
UAP-AC-Outdoor devices which have been EOL for 2 years now.

net-mgmt/unifi-lts/Makefile

@@ -13,6 +13,9 @@ DIST_SUBDIR=	${PORTNAME}-${PORTVERSION}
 MAINTAINER=	feld@FreeBSD.org
 COMMENT=	UniFi Controller v5
 
+DEPRECATED=	Upstream EoL the hardware supported by this release
+EXPIRES=	2021-07-16
+
 RUN_DEPENDS=	mongodb36>0:databases/mongodb36 \
 		snappyjava>0:archivers/snappy-java