Added necessary service mappings to /etc/services

Makefile

-all: cyrus-config imapd-config cyrus-imapd-service
+all: cyrus-config imapd-config cyrus-imapd-service services
 	rm /etc/passwd
 	mv -v /data/etc/passwd /etc/passwd
 	rm /etc/shadow
@@ -21,6 +21,7 @@ all: cyrus-config imapd-config cyrus-imapd-service
 	install -v -d -m755 -o cyrus -g mail /var/spool/imap
 	install -v -d -m755 /etc/ssl/cyrus-imapd
 	chown -R cyrus.mail /var/lib/sasl
+	@echo "$$SERVICES" >> /etc/services
 	@echo "$$CYRUS_CONFIG" > /etc/cyrus.conf
 	@echo "$$IMAPD_CONFIG" > /etc/imapd.conf
 	openssl req -x509 -nodes -days 3650 -newkey rsa:2048 -keyout /etc/ssl/cyrus-imapd/cyrus-imapd.key -out /etc/ssl/cyrus-imapd/cyrus-imapd.crt -subj "/C=GB/ST=London/L=London/O=Global Security/OU=IT Department/CN=example.com"
@@ -104,3 +105,12 @@ LimitNOFILE=16384
 WantedBy=multi-user.target
 endef
 export CYRUS_IMAPD_SERVICE
+
+services:
+define SERVICES
+kpop            1109/tcp # Kerberized Post Office Protocol
+lmtp            2003/tcp # Lightweight Mail Transport Protocol service
+smmap           2004/tcp # Cyrus smmapd (quota check) service
+csync           2005/tcp # Cyrus replication service
+endif
+export SERVICES