Enable checkstyle rule to verify method names

Enabled checkstyle rule "MethodName" which checks
if method names adhere to a naming convention and
fixed the violations it found.

Change-Id: I87448a1fa857e78f33c42090d485bf21a8986ba7
diff --git a/src/main/java/net/onrc/onos/core/datastore/IKVClient.java b/src/main/java/net/onrc/onos/core/datastore/IKVClient.java
index 0fa1cbd..c2d9e35 100644
--- a/src/main/java/net/onrc/onos/core/datastore/IKVClient.java
+++ b/src/main/java/net/onrc/onos/core/datastore/IKVClient.java
@@ -161,6 +161,6 @@
      * Version number which represents that the object does not exist, or has
      * never been read the DB before.
      */
-    public long VERSION_NONEXISTENT();
+    public long getVersionNonexistant();
 
 }
diff --git a/src/main/java/net/onrc/onos/core/datastore/IKVTable.java b/src/main/java/net/onrc/onos/core/datastore/IKVTable.java
index 87fee25..9d0c8ee 100644
--- a/src/main/java/net/onrc/onos/core/datastore/IKVTable.java
+++ b/src/main/java/net/onrc/onos/core/datastore/IKVTable.java
@@ -10,7 +10,7 @@
      * Version number which represents that the object does not exist, or has
      * never been read the DB before.
      */
-    public long VERSION_NONEXISTENT();
+    public long getVersionNonexistant();
 
     /**
      * Interface for a class to represent an entry in Table.
@@ -98,7 +98,7 @@
      * Remove a Key-Value entry in table.
      *
      * @param key
-     * @return version of removed object or VERSION_NONEXISTENT, if it did not exist.
+     * @return version of removed object or non existant version if it did not exist.
      */
     public long forceDelete(byte[] key);
 
diff --git a/src/main/java/net/onrc/onos/core/datastore/hazelcast/HZClient.java b/src/main/java/net/onrc/onos/core/datastore/hazelcast/HZClient.java
index 32ff15b..3bfe157 100644
--- a/src/main/java/net/onrc/onos/core/datastore/hazelcast/HZClient.java
+++ b/src/main/java/net/onrc/onos/core/datastore/hazelcast/HZClient.java
@@ -335,7 +335,7 @@
     }
 
     @Override
-    public long VERSION_NONEXISTENT() {
+    public long getVersionNonexistant() {
         return VERSION_NONEXISTENT;
     }
 
diff --git a/src/main/java/net/onrc/onos/core/datastore/hazelcast/HZTable.java b/src/main/java/net/onrc/onos/core/datastore/hazelcast/HZTable.java
index 7b97ec0..20501bb 100644
--- a/src/main/java/net/onrc/onos/core/datastore/hazelcast/HZTable.java
+++ b/src/main/java/net/onrc/onos/core/datastore/hazelcast/HZTable.java
@@ -43,7 +43,7 @@
     }
 
     /**
-     * increment version, avoiding VERSION_NONEXISTENT.
+     * increment version, avoiding versionNonexistant.
      *
      * @param version
      * @return
@@ -320,7 +320,7 @@
     }
 
     @Override
-    public long VERSION_NONEXISTENT() {
+    public long getVersionNonexistant() {
         return HZClient.VERSION_NONEXISTENT;
     }
 }
diff --git a/src/main/java/net/onrc/onos/core/datastore/ramcloud/RCClient.java b/src/main/java/net/onrc/onos/core/datastore/ramcloud/RCClient.java
index d2e1670..3644cfa 100644
--- a/src/main/java/net/onrc/onos/core/datastore/ramcloud/RCClient.java
+++ b/src/main/java/net/onrc/onos/core/datastore/ramcloud/RCClient.java
@@ -566,7 +566,7 @@
     static final long VERSION_NONEXISTENT = JRamCloud.VERSION_NONEXISTENT;
 
     @Override
-    public long VERSION_NONEXISTENT() {
+    public long getVersionNonexistant() {
         return VERSION_NONEXISTENT;
     }
 }
diff --git a/src/main/java/net/onrc/onos/core/datastore/ramcloud/RCTable.java b/src/main/java/net/onrc/onos/core/datastore/ramcloud/RCTable.java
index f7bafd5..3c78cf1 100644
--- a/src/main/java/net/onrc/onos/core/datastore/ramcloud/RCTable.java
+++ b/src/main/java/net/onrc/onos/core/datastore/ramcloud/RCTable.java
@@ -127,7 +127,7 @@
     }
 
     @Override
-    public long VERSION_NONEXISTENT() {
+    public long getVersionNonexistant() {
         return RCClient.VERSION_NONEXISTENT;
     }
 
diff --git a/src/main/java/net/onrc/onos/core/datastore/utils/KVObject.java b/src/main/java/net/onrc/onos/core/datastore/utils/KVObject.java
index 568cfc7..618c31e 100644
--- a/src/main/java/net/onrc/onos/core/datastore/utils/KVObject.java
+++ b/src/main/java/net/onrc/onos/core/datastore/utils/KVObject.java
@@ -49,7 +49,7 @@
 
     /**
      * serialized value version stored on data store or
-     * {@link IKVTable.VERSION_NONEXISTENT()} if is a new object.
+     * {@link IKVTable.getVersionNonexistant()} if is a new object.
      */
     private long version;
 
@@ -59,7 +59,7 @@
     private Map<Object, Object> propertyMap;
 
     public KVObject(final IKVTable table, final byte[] key) {
-        this(table, key, null, table.VERSION_NONEXISTENT());
+        this(table, key, null, table.getVersionNonexistant());
     }
 
     public KVObject(final IKVTable table, final byte[] key, final byte[] value, final long version) {
@@ -324,7 +324,7 @@
                 }
             } else {
                 log.error("MultiRead error, skipping {}, {}", obj.getTable(), obj);
-                obj.version = obj.getTable().VERSION_NONEXISTENT();
+                obj.version = obj.getTable().getVersionNonexistant();
                 failExists = true;
             }
         }