Enable checkstyle Javadoc Comment Style rule

Turn on the Javadoc Comment Style rule and fix
any violations that come up.  This is related to
requiring javadoc description comments to end
with a '.'

Change-Id: I19cf1b9f00d3040987e0b4c8b39461e2e0ad66b5
diff --git a/src/main/java/net/onrc/onos/core/linkdiscovery/ILinkDiscoveryService.java b/src/main/java/net/onrc/onos/core/linkdiscovery/ILinkDiscoveryService.java
index 14e78d8..c5543a2 100644
--- a/src/main/java/net/onrc/onos/core/linkdiscovery/ILinkDiscoveryService.java
+++ b/src/main/java/net/onrc/onos/core/linkdiscovery/ILinkDiscoveryService.java
@@ -31,7 +31,7 @@
     public Map<Link, LinkInfo> getLinks();
 
     /**
-     * Returns link type of a given link
+     * Returns link type of a given link.
      *
      * @param info
      * @return
@@ -45,7 +45,7 @@
     public Map<Long, Set<Link>> getSwitchLinks();
 
     /**
-     * Adds a listener to listen for ILinkDiscoveryService messages
+     * Adds a listener to listen for ILinkDiscoveryService messages.
      *
      * @param listener The listener that wants the notifications
      */
@@ -57,17 +57,17 @@
     public Set<NodePortTuple> getSuppressLLDPsInfo();
 
     /**
-     * Adds a switch port to suppress lldp set
+     * Adds a switch port to suppress lldp set.
      */
     public void addToSuppressLLDPs(long sw, short port);
 
     /**
-     * Removes a switch port from suppress lldp set
+     * Removes a switch port from suppress lldp set.
      */
     public void removeFromSuppressLLDPs(long sw, short port);
 
     /**
-     * Get the set of quarantined ports on a switch
+     * Get the set of quarantined ports on a switch.
      */
     public Set<Short> getQuarantinedPorts(long sw);