[Slim] Fix AbstractAuthenticator constructor TypeError

Created by: ybelenko

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• Read the contribution guidelines.
• Ran the shell script under ./bin/ to update Petstore sample so that CIs can verify the change. (For instance, only need to run ./bin/{LANG}-petstore.sh, ./bin/openapi3/{LANG}-petstore.sh if updating the {LANG} (e.g. php, ruby, python, etc) code generator or {LANG} client's mustache templates). Windows batch files can be found in .\bin\windows\.
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Description of the PR

Current generator requires AbstractAuthenticator user implementation when schema contains security definitions. When implementation class is provided app throws TypeError.

[10-Apr-2019 17:42:41 UTC] PHP Fatal error:  Uncaught TypeError: Argument 1 passed to OpenAPIServer\Auth\AbstractAuthenticator::__construct() 
must implement interface Psr\Container\ContainerInterface, array given, called in 
/Applications/MAMP/htdocs/openapi-generator/samples/server/petstore/php-slim/lib/SlimRouter.php on line 650 and defined in 
/Applications/MAMP/htdocs/openapi-generator/samples/server/petstore/php-slim/lib/Auth/AbstractAuthenticator.php:70

Fixes #2640 (closed)

cc @jebentier, @dkarlovi, @mandrean, @jfastnacht, @ackintosh, @ybelenko, @renepardon