Go server petstore update (OAS2, OAS3) (#146)

* restore go server petstore from codegen 2x

* update go server petstore (oas2) - no diff

* update go server samples (oas3)

* add go petstore server script

bin/openapi3/go-petstore-server.sh

@@ -0,0 +1,32 @@
+#!/bin/sh
+
+SCRIPT="$0"
+
+while [ -h "$SCRIPT" ] ; do
+  ls=`ls -ld "$SCRIPT"`
+  link=`expr "$ls" : '.*-> \(.*\)$'`
+  if expr "$link" : '/.*' > /dev/null; then
+    SCRIPT="$link"
+  else
+    SCRIPT=`dirname "$SCRIPT"`/"$link"
+  fi
+done
+
+if [ ! -d "${APP_DIR}" ]; then
+  APP_DIR=`dirname "$SCRIPT"`/..
+  APP_DIR=`cd "${APP_DIR}"; pwd`
+fi
+
+executable="./modules/openapi-generator-cli/target/openapi-generator-cli.jar"
+
+if [ ! -f "$executable" ]
+then
+  mvn clean package
+fi
+
+# if you've executed sbt assembly previously it will use that instead.
+export JAVA_OPTS="${JAVA_OPTS} -XX:MaxPermSize=256M -Xmx1024M -DloggerPath=conf/log4j.properties"
+
+ags="$@ generate -t modules/openapi-generator/src/main/resources/go-server -i modules/openapi-generator/src/test/resources/3_0/petstore.yaml -l go-server -o samples/server/petstore/go-api-server -DpackageName=petstoreserver  --additional-properties hideGenerationTimestamp=true -Dservice"
+
+java $JAVA_OPTS -jar $executable $ags

samples/server/petstore/go-api-server/.swagger-codegen/VERSION

@@ -1 +1 @@
-2.4.0-SNAPSHOT
+3.0.0-SNAPSHOT