Refactor async-onerror pom (#403)

diff --git a/dubbo-samples-async/dubbo-samples-async-onerror/pom.xml b/dubbo-samples-async/dubbo-samples-async-onerror/pom.xml
index 445c592..bf1adee 100644
--- a/dubbo-samples-async/dubbo-samples-async-onerror/pom.xml
+++ b/dubbo-samples-async/dubbo-samples-async-onerror/pom.xml
@@ -33,12 +33,9 @@
         <target.level>1.8</target.level>
         <spring.version>4.3.16.RELEASE</spring.version>
         <dubbo.version>3.0.2.1</dubbo.version>
-        <zookeeper.version>3.7.0</zookeeper.version>
-        <curator.version>5.1.0</curator.version>
         <validation-api.version>1.1.0.Final</validation-api.version>
         <hibernate-validator.version>4.2.0.Final</hibernate-validator.version>
         <resteasy.version>3.0.19.Final</resteasy.version>
-        <curator-client.version>5.1.0</curator-client.version>
         <swagger.version>1.5.19</swagger.version>
         <tomcat.version>7.0.88</tomcat.version>
         <servlet.version>3.0.1</servlet.version>
@@ -104,17 +101,6 @@
                 <version>${dubbo.version}</version>
             </dependency>
             <dependency>
-                <groupId>org.apache.curator</groupId>
-                <artifactId>curator-framework</artifactId>
-                <version>${curator.version}</version>
-                <exclusions>
-                    <exclusion>
-                        <groupId>org.apache.zookeeper</groupId>
-                        <artifactId>zookeeper</artifactId>
-                    </exclusion>
-                </exclusions>
-            </dependency>
-            <dependency>
                 <groupId>javax.validation</groupId>
                 <artifactId>validation-api</artifactId>
                 <version>${validation-api.version}</version>
@@ -130,17 +116,6 @@
                 <version>${resteasy.version}</version>
             </dependency>
             <dependency>
-                <groupId>org.apache.curator</groupId>
-                <artifactId>curator-client</artifactId>
-                <version>${curator-client.version}</version>
-                <exclusions>
-                    <exclusion>
-                        <groupId>org.apache.zookeeper</groupId>
-                        <artifactId>zookeeper</artifactId>
-                    </exclusion>
-                </exclusions>
-            </dependency>
-            <dependency>
                 <groupId>javax.servlet</groupId>
                 <artifactId>javax.servlet-api</artifactId>
                 <version>${servlet.version}</version>
@@ -176,34 +151,6 @@
             <type>pom</type>
         </dependency>
         <dependency>
-            <groupId>org.apache.curator</groupId>
-            <artifactId>curator-framework</artifactId>
-            <exclusions>
-                <exclusion>
-                    <groupId>io.netty</groupId>
-                    <artifactId>netty</artifactId>
-                </exclusion>
-                <exclusion>
-                    <groupId>org.apache.zookeeper</groupId>
-                    <artifactId>zookeeper</artifactId>
-                </exclusion>
-            </exclusions>
-        </dependency>
-        <dependency>
-            <groupId>org.apache.zookeeper</groupId>
-            <artifactId>zookeeper</artifactId>
-        </dependency>
-        <dependency>
-            <groupId>org.apache.curator</groupId>
-            <artifactId>curator-x-discovery</artifactId>
-            <exclusions>
-                <exclusion>
-                    <groupId>org.apache.zookeeper</groupId>
-                    <artifactId>zookeeper</artifactId>
-                </exclusion>
-            </exclusions>
-        </dependency>
-        <dependency>
             <groupId>org.apache.dubbo</groupId>
             <artifactId>dubbo</artifactId>
         </dependency>