Remove fixed version dependencies

* io.swagger:swagger-core:1.5.17
* io.swagger:swagger-models:1.5.17

Author: jmini

modules/swagger-codegen/pom.xml

@@ -198,16 +198,6 @@
         <diffutils-version>1.3.0</diffutils-version>
     </properties>
     <dependencies>
-        <dependency>
-            <groupId>io.swagger</groupId>
-            <artifactId>swagger-models</artifactId>
-            <version>1.5.17</version>
-        </dependency>
-        <dependency>
-            <groupId>io.swagger</groupId>
-            <artifactId>swagger-core</artifactId>
-            <version>1.5.17</version>
-        </dependency>
         <dependency>
             <groupId>io.swagger.core.v3</groupId>
             <artifactId>swagger-models</artifactId>