Reset some codes.

apm-sniffer/apm-sniffer-mock/src/main/java/org/skywalking/apm/sniffer/mock/trace/tag/BooleanTagGetter.java

-package org.skywalking.apm.sniffer.mock.trace.tag;
-
-import org.skywalking.apm.trace.Span;
-import org.skywalking.apm.trace.tag.BooleanTag;
-
-/**
- * Test case util for getting the {@link Boolean} type of the tag value.
- *
- * @author wusheng
- */
-public class BooleanTagGetter {
-    public static Boolean get(Span span, BooleanTag tag) {
-        return span.getBoolTag(tag.key());
-    }
-}

apm-sniffer/apm-sniffer-mock/src/main/java/org/skywalking/apm/sniffer/mock/trace/tag/IntTagGetter.java

-package org.skywalking.apm.sniffer.mock.trace.tag;
-
-import org.skywalking.apm.trace.Span;
-import org.skywalking.apm.trace.tag.IntTag;
-
-/**
- * Test case util for getting the {@link Integer} type of the tag value.
- *
- * @author wusheng
- */
-public class IntTagGetter {
-    public static Integer get(Span span, IntTag tag) {
-        return span.getIntTag(tag.key());
-    }
-}

apm-sniffer/apm-sniffer-mock/src/main/java/org/skywalking/apm/sniffer/mock/trace/tag/StringTagGetter.java

-package org.skywalking.apm.sniffer.mock.trace.tag;
-
-import org.skywalking.apm.trace.Span;
-import org.skywalking.apm.trace.tag.StringTag;
-
-/**
- * Test case util for getting the {@link String} type of the tag value.
- *
- * @author wusheng
- */
-public class StringTagGetter {
-    public static String get(Span span, StringTag tag) {
-        return span.getStrTag(tag.key());
-    }
-}