use lego names for certificates

rootfs/etc/confd/templates/murmur.ini.tmpl

@@ -157,8 +157,8 @@ registerName={{ getenv "ROOT_NAME" "Root" }}
 
 # If you have a proper SSL certificate, you can provide the filenames here.
 # Otherwise, Murmur will create it's own certificate automatically.
-sslCert=/etc/ssl/murmur/tls.crt
-sslKey=/etc/ssl/murmur/tls.key
+sslCert=/etc/ssl/murmur/cert.pem
+sslKey=/etc/ssl/murmur/key.pem
 
 # The sslCiphers option chooses the cipher suites to make available for use
 # in SSL/TLS. This option is server-wide, and cannot be set on a