[jaxrs-cfx][server] delete output dir before building sample files (#452)

bin/jaxrs-cxf-petstore-server.sh:

* delete output dir before building sample
* add comment before deleting files

bin/jaxrs-cxf-petstore-server.sh

@@ -25,6 +25,9 @@ then
   mvn -B clean package
 fi
 
+echo "Removing files and folders under samples/server/petstore/jaxrs-cxf"
+rm -rf samples/server/petstore/jaxrs-cxf
+
 # if you've executed sbt assembly previously it will use that instead.
 export JAVA_OPTS="${JAVA_OPTS} -XX:MaxPermSize=256M -Xmx1024M -DloggerPath=conf/log4j.properties"
 ags="generate -t modules/openapi-generator/src/main/resources/JavaJaxRS/cxf -i modules/openapi-generator/src/test/resources/2_0/petstore-with-fake-endpoints-models-for-testing.yaml -g jaxrs-cxf -o samples/server/petstore/jaxrs-cxf -DhideGenerationTimestamp=true --additional-properties serverPort=8082 $@"

samples/server/petstore/jaxrs-cxf/src/main/java/org/openapitools/api/impl/PetApiServiceImpl.java

@@ -112,7 +112,7 @@ public class PetApiServiceImpl implements PetApi {
     }
     
     /**
-     * uploads an image
+     * uploads an image (required)
      *
      */
     public ModelApiResponse uploadFileWithRequiredFile(Long petId,  Attachment fileDetail, String additionalMetadata) {

samples/server/petstore/jaxrs-cxf/src/test/java/org/openapitools/api/PetApiTest.java

@@ -213,7 +213,7 @@ public class PetApiTest {
     }
     
     /**
-     * uploads an image
+     * uploads an image (required)
      *
      * @throws ApiException
      *          if the Api call fails