RANGER-4915:Fix the default SSL Ciphers are too weak issue for user sync service (#375)

diff --git a/unixauthservice/scripts/ranger-usersync-services.sh b/unixauthservice/scripts/ranger-usersync-services.sh
index d6db7aa..5b1c2e4 100644
--- a/unixauthservice/scripts/ranger-usersync-services.sh
+++ b/unixauthservice/scripts/ranger-usersync-services.sh
@@ -113,7 +113,7 @@
         fi
     fi
 	SLEEP_TIME_AFTER_START=5
-	nohup java -Dproc_rangerusersync -Dlogback.configurationFile=file:${USERSYNC_CONF_DIR}/logback.xml ${JAVA_OPTS} -Duser=${USER} -Dhostname=${HOSTNAME} -Dlogdir="${logdir}" -cp "${cp}" org.apache.ranger.authentication.UnixAuthenticationService -enableUnixAuth > ${logdir}/auth.log 2>&1 &
+	nohup java -Dproc_rangerusersync -Djdk.tls.ephemeralDHKeySize=2048 -Dlogback.configurationFile=file:${USERSYNC_CONF_DIR}/logback.xml ${JAVA_OPTS} -Duser=${USER} -Dhostname=${HOSTNAME} -Dlogdir="${logdir}" -cp "${cp}" org.apache.ranger.authentication.UnixAuthenticationService -enableUnixAuth > ${logdir}/auth.log 2>&1 &
 	VALUE_OF_PID=$!
     echo "Starting Apache Ranger Usersync Service"
     sleep $SLEEP_TIME_AFTER_START