Fix javadoc warnings

[WARNING] /Users/rascov/onos/providers/lldp/src/main/java/org/onosproject/provider/lldp/impl/SuppressionRulesStore.java:88: warning: no description for @throws
[WARNING] /Users/rascov/onos/providers/lldp/src/main/java/org/onosproject/provider/lldp/impl/SuppressionRulesStore.java:146: warning: no description for @throws
[WARNING] /Users/rascov/onos/apps/sdnip/src/main/java/org/onosproject/sdnip/bgp/BgpSession.java:706: warning: no @param for ctx
[WARNING] /Users/rascov/onos/apps/sdnip/src/main/java/org/onosproject/sdnip/bgp/BgpSession.java:751: warning: no @param for ctx

Change-Id: Iae4d1826249e3612e1a16d1a9eeaebdc4c032f35

@@ -702,6 +702,8 @@ public class BgpSession extends SimpleChannelHandler {
 
     /**
      * Restarts the BGP KeepaliveTimer.
+     *
+     * @param ctx the Channel Handler Context to use
      */
     void restartKeepaliveTimer(ChannelHandlerContext ctx) {
         if (localKeepaliveInterval == 0) {
@@ -747,6 +749,8 @@ public class BgpSession extends SimpleChannelHandler {
 
     /**
      * Restarts the BGP Session Timeout Timer.
+     *
+     * @param ctx the Channel Handler Context to use
      */
     void restartSessionTimeoutTimer(ChannelHandlerContext ctx) {
         if (remoteHoldtime == 0) {

@@ -85,7 +85,7 @@ public class SuppressionRulesStore {
      * Returns SuppressionRules.
      *
      * @return SuppressionRules
-     * @throws IOException
+     * @throws IOException if error occurred while reading the data
      */
     public SuppressionRules read() throws IOException {
         final Set<DeviceId> suppressedDevice = new HashSet<>();
@@ -143,7 +143,7 @@ public class SuppressionRulesStore {
      * Writes the given SuppressionRules.
      *
      * @param rules SuppressionRules
-     * @throws IOException
+     * @throws IOException if error occurred while writing the data
      */
     public void write(SuppressionRules rules) throws IOException {
         ObjectMapper mapper = new ObjectMapper();