update check-vpc-vpn.rb to aws-sdk-v2  (#173)
update check-vpc-vpn.rb to aws-sdk-v2  (#173)

* add metrics-rds.rb

* change to aws-sdk-v2

* delete unused block

* fix rubocop

* delete def aws_config

* delete role and credentials

* add new check for asg instances

* correct licence

* fix #164 pull request

* add check instances in Service in loadbalancer

* fix issues & add a new check

* fix issues

* add include common and delete unused config

* fix rubocop

* update for using aws sdk version 2

* fix rubocop

* add asg metric check

* fix rubocop

* new check elasticache

*  fix rubocop

* fix rubocop

* update check-vpc-vpn.rb to aws-sdk-v2

* fix rubocop

obazoud/sensu-plugins-aws,obazoud/sensu-plugins-aws,sensu-plugins/sensu-plugins-aws,majormoses/sensu-plugins-aws,brendangibat/sensu-plugins-aws,majormoses/sensu-plugins-aws,sstarcher/sensu-plugins-aws