ntp: make ntp and alternative for ntpd

This way ntp can be used as an alternative to ntpd from busybox

Signed-off-by: Pascal Bach <pascal.bach@siemens.com>
Signed-off-by: Martin Jansa <Martin.Jansa@gmail.com>
Signed-off-by: Joe MacDonald <joe_macdonald@mentor.com>

meta-networking/recipes-support/ntp/ntp_4.2.8p8.bb

@@ -126,7 +126,7 @@ RCONFLICTS_ntpdate += "ntpdate-systemd"
 
 RSUGGESTS_${PN} = "iana-etc"
 
-FILES_${PN} = "${sbindir}/ntpd ${sysconfdir}/ntp.conf ${sysconfdir}/init.d/ntpd ${libdir} \
+FILES_${PN} = "${sbindir}/ntpd.ntp ${sysconfdir}/ntp.conf ${sysconfdir}/init.d/ntpd ${libdir} \
     ${NTP_USER_HOME} \
     ${systemd_unitdir}/ntp-units.d/60-ntpd.list ${libexecdir}\
 "
@@ -159,3 +159,9 @@ pkg_postinst_ntpdate() {
     fi
 }
 
+inherit update-alternatives
+
+ALTERNATIVE_PRIORITY = "100"
+
+ALTERNATIVE_${PN} = "ntpd"
+ALTERNATIVE_LINK_NAME[ntpd] = "${sbindir}/ntpd"