[fix][build] Remove io.grpc.netty relocation

Signed-off-by: Zixuan Liu <nodeces@gmail.com>

Author: nodece

jetcd-core-shaded/pom.xml

@@ -107,11 +107,6 @@
                   <rawString>true</rawString>
                 </relocation>
                 <!-- relocate to use grpc-netty-shaded packages -->
-                <relocation>
-                  <pattern>io.grpc.netty</pattern>
-                  <shadedPattern>io.grpc.netty.shaded.io.grpc.netty</shadedPattern>
-                </relocation>
-                <!-- relocate to use grpc-netty-shaded packages -->
                 <relocation>
                   <pattern>io.netty</pattern>
                   <shadedPattern>io.grpc.netty.shaded.io.netty</shadedPattern>