Update Swagger to 1.6.2 and Maven Swagger Plugin to 3.1.7 (apache#8845)

### Motivation

In out build environment (MagNews.com) we are upgrading Swagger to 1.6.2, as it is also used by Pulsar Builder system we would like to upgrade Swagger here as well.
Even if Swagger is used for documentation, swagger-core is a runtime dependency so it is better to guarantee that Pulsar is working well with latest version of Swagger 1.X.

I am also upgrading the Maven Swagger Plugin to 3.1.7, the 3.1.8 is buggy and it fails the build with NPE (the same problem occurs even in MagNews build, so it is not related to Pulsar itself)

### Modifications
- Upgrade Swagger version to 1.6.2
- Upgrade Maven Plugin to 3.1.7

distribution/server/src/assemble/LICENSE.bin.txt

@@ -339,9 +339,9 @@ The Apache Software License, Version 2.0
  * J2ObjC Annotations -- com.google.j2objc-j2objc-annotations-1.3.jar
  * Netty Reactive Streams -- com.typesafe.netty-netty-reactive-streams-2.0.4.jar
  * Swagger
-    - io.swagger-swagger-annotations-1.5.21.jar
-    - io.swagger-swagger-core-1.5.21.jar
-    - io.swagger-swagger-models-1.5.21.jar
+    - io.swagger-swagger-annotations-1.6.2.jar
+    - io.swagger-swagger-core-1.6.2.jar
+    - io.swagger-swagger-models-1.6.2.jar
  * DataSketches
     - com.yahoo.datasketches-memory-0.8.3.jar
     - com.yahoo.datasketches-sketches-core-0.8.3.jar

pom.xml

@@ -117,7 +117,7 @@ flexible messaging model and an intuitive client API.</description>
     <jackson.version>2.11.1</jackson.version>
     <jackson.databind.version>2.11.1</jackson.databind.version>
     <reflections.version>0.9.11</reflections.version>
-    <swagger.version>1.5.21</swagger.version>
+    <swagger.version>1.6.2</swagger.version>
     <puppycrawl.checkstyle.version>8.37</puppycrawl.checkstyle.version>
     <dockerfile-maven.version>1.4.13</dockerfile-maven.version>
     <typetools.version>0.5.0</typetools.version>

pulsar-broker/pom.xml

@@ -445,7 +445,7 @@
           <plugin>
             <groupId>com.github.kongchen</groupId>
             <artifactId>swagger-maven-plugin</artifactId>
-            <version>3.1.5</version>
+            <version>3.1.7</version>
             <configuration>
               <apiSources>
                 <apiSource>

pulsar-sql/presto-distribution/LICENSE

@@ -459,7 +459,7 @@ The Apache Software License, Version 2.0
   * Apache Yetus Audience Annotations
     - audience-annotations-0.5.0.jar
   * Swagger
-    - swagger-annotations-1.5.21.jar
+    - swagger-annotations-1.6.2.jar
 
 Protocol Buffers License
  * Protocol Buffers