FWKNOP - adding notes to access.conf

Just a small patch to add 3 lines of notes to /etc/fwknop/access.conf
& undocumented GPG_ALLOW_NO_PW so gpg keys are setup correctly in an
automated environment.

testing/fwknop/APKBUILD

 # Maintainer: Natanael Copa <ncopa@alpinelinux.org>
 pkgname=fwknop
 pkgver=2.5.1
-pkgrel=0
+pkgrel=1
 pkgdesc="A Single Packet Authorization (SPA) implementation"
 url="http://www.cipherdyne.org/fwknop/"
 arch="all"
@@ -45,6 +45,10 @@ package() {
 	make DESTDIR="$pkgdir" install || return 1
 	rm -f "$pkgdir"/usr/lib/*.la || return 1
 	install -Dm755 "$srcdir"/fwknopd.initd "$pkgdir"/etc/init.d/fwknopd
+	echo "# If using gnupg2 see http://www.gnupg.org/faq/GnuPG-FAQ.html#how-can-i-use-gnupg-in-an-automated-environment" >> "$pkgdir"/etc/fwknop/access.conf
+	echo "# & sign the client public key on the server with a normal key which has a password" >> "$pkgdir"/etc/fwknop/access.conf
+	echo "# disable GPG_DECRYPT_PW & enable the following variable:" >> "$pkgdir"/etc/fwknop/access.conf
+	echo "#GPG_ALLOW_NO_PW: Y;" >> "$pkgdir"/etc/fwknop/access.conf
 }
 
 server() {