Update php related samples (#375)

* Update php client (OAS3)

bin/openapi3/php-petstore.sh

* Update symfony server (OAS2)

bin/php-symfony-petstore.sh

* Lumen: remove 'swagger'

* Update lumen server (OAS2)

* Update php client (security): deleted 'SwaggerClient-php' folder

* Update TEST_DIR

* Update php client tests (OAS3)

bin/openapi3/php-petstore.sh

* Update php client (OAS2)

bin/php-petstore.sh

* Fix

* Fix lumen -> php-lumen

* Update lumen server (security)

* Delete moved files

currently it will generate into under 'lib' folder.

* Fix slim -> php-slim

* Update slim server (security)

bin/security/slim-petstore-server.sh

* Fix

* Update dot files

samples/server/petstore/php-symfony/SymfonyBundle-php/composer.json

@@ -2,16 +2,16 @@
     "name": "openapi/server-bundle",
     "description": "",
     "keywords": [
-        "swagger",
+        "openapi",
         "php",
         "sdk",
         "api"
     ],
-    "homepage": "http://swagger.io",
+    "homepage": "https://github.com/openapitools/openapi-generator",
     "license": "proprietary",
     "authors": [
         {
-            "name": "Swagger and contributors",
+            "name": "openapi-generator contributors",
             "homepage": "https://github.com/openapitools/openapi-generator"
         }
     ],