[KYUUBI #392] Remove netty dependency

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### _Why are the changes needed?_
<!--
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  1. If you add a feature, you can talk about the use case of it.
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netty is unnecessary

### _How was this patch tested?_
- [ ] Add some test cases that check the changes thoroughly including negative and positive cases if possible

- [ ] Add screenshots for manual tests if appropriate

- [x] [Run test](https://kyuubi.readthedocs.io/en/latest/tools/testing.html#running-tests) locally before make a pull request

Closes #392 from yaooqinn/netty.

824d84e [Kent Yao] nit
402317d [Kent Yao] Remove netty dependency

Authored-by: Kent Yao <yao@apache.org>
Signed-off-by: Kent Yao <yao@apache.org>

kyuubi-assembly/pom.xml

@@ -77,10 +77,6 @@
             <artifactId>curator-test</artifactId>
         </dependency>
 
-        <dependency>
-            <groupId>io.netty</groupId>
-            <artifactId>netty</artifactId>
-        </dependency>
         <!-- end: for EmbeddedZkServer -->
 
         <!-- default package with log4j -->

kyuubi-ha/pom.xml

@@ -65,12 +65,6 @@
             <artifactId>curator-test</artifactId>
             <scope>provided</scope>
         </dependency>
-
-        <dependency>
-            <groupId>io.netty</groupId>
-            <artifactId>netty</artifactId>
-            <scope>provided</scope>
-        </dependency>
         <!-- End: for EmbeddedZkServer -->
 
         <dependency>

kyuubi-main/pom.xml

@@ -115,12 +115,6 @@
             <scope>test</scope>
         </dependency>
 
-        <dependency>
-            <groupId>io.netty</groupId>
-            <artifactId>netty</artifactId>
-            <scope>test</scope>
-        </dependency>
-
         <dependency>
             <groupId>org.apache.iceberg</groupId>
             <artifactId>${iceberg.name}</artifactId>

pom.xml

@@ -67,7 +67,6 @@
         <curator.version>2.12.0</curator.version>
         <hadoop.version>2.7.4</hadoop.version>
         <hive.version>2.3.7</hive.version>
-        <netty3.version>3.7.0.Final</netty3.version>
         <spark.version>3.0.2</spark.version>
         <slf4j.version>1.7.30</slf4j.version>
         <zookeeper.version>3.4.14</zookeeper.version>
@@ -806,12 +805,6 @@
                 </exclusions>
             </dependency>
 
-            <dependency>
-                <groupId>io.netty</groupId>
-                <artifactId>netty</artifactId>
-                <version>${netty3.version}</version>
-            </dependency>
-
             <dependency>
                 <groupId>org.apache.iceberg</groupId>
                 <artifactId>${iceberg.name}</artifactId>