sec-keys.eclass: for SLOT= packages, add slot to filename

Seen for example with apache-tomcat. It has separate keys per major
version, parallel installable, with different release managers.

Although that ebuild doesn't use "apache-tomcat" as the filename base,
handling SLOT is necessary before considering to do so.

Signed-off-by: Eli Schwartz <eschwartz@gentoo.org>

eclass/sec-keys.eclass

@@ -198,7 +198,11 @@ sec-keys_src_test() {
 # installed to the standard /usr/share/openpgp-keys.
 sec-keys_src_install() {
 	insinto /usr/share/openpgp-keys
-	doins ${PN#openpgp-keys-}.asc
+
+	case ${SLOT} in
+		0) doins ${PN#openpgp-keys-}.asc;;
+		*) newins ${PN#openpgp-keys-}.asc ${PN#openpgp-keys-}-${SLOT}.asc;;
+	esac
 }
 
 fi