Polished BMv2 protocol module

- Improved and fixed typos in javadocs
- Added missing beta API annotations
- Refactored the default interpreter implementation

Change-Id: Ibfb21d31415d8f25cc67307f8bea2871951c9a8f
diff --git a/protocols/bmv2/api/src/main/java/org/onosproject/bmv2/api/runtime/Bmv2ExactMatchParam.java b/protocols/bmv2/api/src/main/java/org/onosproject/bmv2/api/runtime/Bmv2ExactMatchParam.java
index d02dd2d..5b55d28 100644
--- a/protocols/bmv2/api/src/main/java/org/onosproject/bmv2/api/runtime/Bmv2ExactMatchParam.java
+++ b/protocols/bmv2/api/src/main/java/org/onosproject/bmv2/api/runtime/Bmv2ExactMatchParam.java
@@ -16,6 +16,7 @@
 
 package org.onosproject.bmv2.api.runtime;
 
+import com.google.common.annotations.Beta;
 import com.google.common.base.MoreObjects;
 import com.google.common.base.Objects;
 import org.onlab.util.ImmutableByteSequence;
@@ -23,8 +24,9 @@
 import static com.google.common.base.Preconditions.checkNotNull;
 
 /**
- * Representation of a BMv2 exact match parameter.
+ * A BMv2 exact match parameter.
  */
+@Beta
 public final class Bmv2ExactMatchParam implements Bmv2MatchParam {
 
     private final ImmutableByteSequence value;
@@ -45,7 +47,7 @@
     }
 
     /**
-     * Return the byte sequence value matched by this parameter.
+     * Return the byte sequence matched by this parameter.
      *
      * @return an immutable byte buffer value
      */