Merge pull request #542 from OpenSkywalking/fix/sjdbcbug

delete the compile plugin in sharing jdbc agent plugin pom file.

apm-sniffer/apm-sdk-plugin/sharding-jdbc-1.5.x-plugin/pom.xml

@@ -72,15 +72,6 @@
                     </execution>
                 </executions>
             </plugin>
-            <plugin>
-                <groupId>org.apache.maven.plugins</groupId>
-                <artifactId>maven-compiler-plugin</artifactId>
-                <configuration>
-                    <source>1.8</source>
-                    <target>1.8</target>
-                </configuration>
-            </plugin>
         </plugins>
     </build>
-    
 </project>