Python AIOHTTP server generator (#1470)

* Astract factory for generators based on connexion

* Add aiohttp server generator

* Fix flask tests

* Normalize python-flask folder names

bin/python-server-flask-petstore-python2.sh

@@ -0,0 +1,50 @@
+#!/bin/sh
+
+SCRIPT="$0"
+echo "# START SCRIPT: $SCRIPT"
+
+while [ -h "$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 "$executable" ]
+then
+  mvn -B clean package
+fi
+
+generator=python-flask
+input=modules/openapi-generator/src/test/resources/2_0/petstore.yaml
+out_folder=samples/server/petstore/$generator-python2
+resources=modules/openapi-generator/src/main/resources/$generator
+
+# if you've executed sbt assembly previously it will use that instead.
+export JAVA_OPTS="${JAVA_OPTS} -Xmx1024M -DloggerPath=conf/log4j.properties"
+ags="generate -t $resources -i $input -g $generator -o $out_folder -c bin/supportPython2.json -D service $@"
+
+rm -rf $out_folder/.openapi*
+rm -rf $out_folder/openapi_server
+rm $out_folder/.dockerignore
+rm $out_folder/.gitignore
+rm $out_folder/.travis.yml
+rm $out_folder/Dockerfile
+rm $out_folder/git_push.sh
+rm $out_folder/README.md
+rm $out_folder/requirements.txt
+rm $out_folder/setup.py
+rm $out_folder/test-requirements.txt
+rm $out_folder/tox.ini
+
+java $JAVA_OPTS -jar $executable $ags