DATACOUCH-580 - Do not automatically insert n1ql.filter predicate in string query.

Since it is difficult to determine where the n1ql.filter (which typically
filters on _class), and also because it is not mandator, including
the n1ql.filter in the @query is left up to the author of the query.
Example:
@query("#{#n1ql.selectEntity} where #{#n1ql.filter} and lastname = $1")

src/main/java/org/springframework/data/couchbase/core/query/StringQuery.java

@@ -21,16 +21,17 @@ import org.springframework.data.couchbase.core.ReactiveCouchbaseTemplate;
 import org.springframework.data.couchbase.repository.query.StringBasedN1qlQueryParser;
 
 /**
- * @author Michael Reiche
- *
  * Query created from the string in @Query annotation in the repository interface.
- *
- *      @Query("#{#n1ql.selectEntity} where firstname = $1 and lastname = $2")
- * 	    List<User>  getByFirstnameAndLastname(String firstname, String lastname);
- *
- * It must include the SELECT ... FROM ... preferably via the #n1ql expression
- * In addition to any predicates in the string, a predicate for the domainType (class)
- * will be added.
+ * 
+ * <pre>
+ * &#64;Query("#{#n1ql.selectEntity} where #{#n1ql.filter} and firstname = $1 and lastname = $2")
+ * List<User> getByFirstnameAndLastname(String firstname, String lastname);
+ * </pre>
+ * 
+ * It must include the SELECT ... FROM ... preferably via the #n1ql expression, in addition to any predicates required,
+ * including the n1ql.filter (for _class = className)
+ * 
+ * @author Michael Reiche
  */
 public class StringQuery extends Query {
 
@@ -41,10 +42,10 @@ public class StringQuery extends Query {
 	}
 
 	/**
-	 * inlineN1qlQuery (Query Annotation)
-	 * append the string query to the provided StringBuilder.
-	 * To be used along with the other append*() methods to construct the N1QL statement
-	 * @param	sb - StringBuilder
+	 * inlineN1qlQuery (Query Annotation) append the string query to the provided StringBuilder. To be used along with the
+	 * other append*() methods to construct the N1QL statement
+	 * 
+	 * @param sb - StringBuilder
 	 */
 	private void appendInlineN1qlStatement(final StringBuilder sb) {
 		sb.append(inlineN1qlQuery);
@@ -52,11 +53,8 @@ public class StringQuery extends Query {
 
 	@Override
 	public String toN1qlString(ReactiveCouchbaseTemplate template, Class domainClass, boolean isCount) {
-		StringBasedN1qlQueryParser.N1qlSpelValues n1ql = getN1qlSpelValues(template, domainClass, isCount);
 		final StringBuilder statement = new StringBuilder();
 		appendInlineN1qlStatement(statement); // apply the string statement
-		appendWhereString(statement, n1ql.filter); // typeKey = typeValue
-
 		// To use generated parameters for literals
 		// we need to figure out if we must use positional or named parameters
 		// If we are using positional parameters, we need to start where