blocklist: Rename blacklist to blocklist

Follow up upstream rename from blacklist to blocklist.

- Old names and rc scripts are still valid, but emitting an ugly warning
- Old firewall rules and anchor names should work, but emitting an ugly
  warning
- Old MK_BLACKLIST* knobs are wired to the new ones

Although care has been taken not to break current configurations, this
is a large patch containing mostly duplicated code.  If issues arise, it
will be swiftly reverted.

Reviewed by:	ivy (pkgbase)
Approved by:	emaste (mentor)
MFC after:	2 days
Relnotes:	yes

share/mk/src.opts.mk

@@ -66,6 +66,7 @@ __DEFAULT_YES_OPTIONS = \
     AUTOFS \
     BHYVE \
     BLACKLIST \
+    BLOCKLIST \
     BLUETOOTH \
     BOOT \
     BOOTPARAMD \
@@ -242,6 +243,7 @@ __LIBC_MALLOC_DEFAULT=	jemalloc
 #
 .for var in \
     BLACKLIST \
+    BLOCKLIST \
     BZIP2 \
     INET \
     INET6 \
@@ -391,6 +393,14 @@ MK_SOURCELESS_HOST:=	no
 MK_SOURCELESS_UCODE:= no
 .endif
 
+.if ${MK_BLACKLIST} == "no"
+MK_BLOCKLIST:=	no
+.endif
+
+.if ${MK_BLACKLIST_SUPPORT} == "no"
+MK_BLOCKLIST_SUPPORT:=	no
+.endif
+
 .if ${MK_CDDL} == "no"
 MK_CTF:=	no
 MK_DTRACE:=	no