Skip bootstrap test coverage

pom.xml

@@ -770,6 +770,7 @@
                             <exclude>org/apache/shardingsphere/**/autogen/*.class</exclude>
                             <exclude>org/apache/shardingsphere/**/*Test.class</exclude>
                             <exclude>org/apache/shardingsphere/test/**/*.class</exclude>
+                            <exclude>org/apache/shardingsphere/proxy/**/*Bootstrap.class</exclude>
                         </excludes>
                     </instrumentation>
                 </configuration>