[ONOS-4849] NETCONF function for FUJITSU OLT #6

- Add alart command for FUJITSU OLT
   volt-notification-alertfilter <netconf:target>
   volt-notification-setalertfilter <netconf:target> <alert-severity>
   volt-notification-subscribe <netconf:target> {disable}
- Update fujitsu-drivers.xml and shell-config.xml in FUJITSU directory
- Apply Yuta's and Andrea's suggestion to startSubscription method and other methods which related to startSubscription method.
  -> Remove startSubscriptionConnection() and createSubscriptionString() method in 4th patch-set.
  -> Modify cosmetic issue related to Static-string.
  -> Update "No replay" to "No reply" in VoltGetPonLinksCommand.java

Change-Id: I2c8d5484ea0ff9f0b1b970fe8b183bec12193c46
diff --git a/drivers/fujitsu/src/main/resources/fujitsu-drivers.xml b/drivers/fujitsu/src/main/resources/fujitsu-drivers.xml
index 46cb697..3547394 100644
--- a/drivers/fujitsu/src/main/resources/fujitsu-drivers.xml
+++ b/drivers/fujitsu/src/main/resources/fujitsu-drivers.xml
@@ -30,5 +30,7 @@
                    impl="org.onosproject.drivers.fujitsu.FujitsuVoltOnuConfig"/>
         <behaviour api="org.onosproject.drivers.fujitsu.behaviour.VoltOnuOperConfig"
                    impl="org.onosproject.drivers.fujitsu.FujitsuVoltOnuOperConfig"/>
+        <behaviour api="org.onosproject.drivers.fujitsu.behaviour.VoltAlertConfig"
+                   impl="org.onosproject.drivers.fujitsu.FujitsuVoltAlertConfig"/>
     </driver>
-</drivers>
\ No newline at end of file
+</drivers>