[C++ server] Adjust the names (script, sample folder, generator) to lang option (#250)

* Renamce C++ server scripts

* Change output folder

* Rename sample folder: pistache-server -> cpp-pistache

* Rename sample folder: restbed -> cpp-restbed

bin/cpp-pistache-server-petstore.sh

@@ -27,6 +27,6 @@ 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 -g cpp-pistache-server -i modules/openapi-generator/src/test/resources/2_0/petstore.yaml -o samples/server/petstore/pistache-server $@"
+ags="generate -g cpp-pistache-server -i modules/openapi-generator/src/test/resources/2_0/petstore.yaml -o samples/server/petstore/cpp-pistache $@"
 
 java $JAVA_OPTS -jar $executable $ags

bin/cpp-restbed-petstore-server.sh

@@ -27,6 +27,6 @@ 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 -g cpp-restbed-server -i modules/openapi-generator/src/test/resources/2_0/petstore.yaml -o samples/server/petstore/restbed $@"
+ags="generate -g cpp-restbed-server -i modules/openapi-generator/src/test/resources/2_0/petstore.yaml -o samples/server/petstore/cpp-restbed $@"
 
 java $JAVA_OPTS -jar $executable $ags