Bump all plugins dependency on sensu-plugin to 2.0

[majormoses]

Bump all plugins dependency on sensu-plugin to 2.0

This is a breaking change and would be across all plugins and needs to be done with care, I see the following as a set of prerequisite before doing this:

• ensure that all plugins can successfully build against ruby 2.4 (add testing of 2.4.1 to travis has been started)
• ensure that all plugins can execute successfully against ruby 2.4

When we do this we leave behind all sensu installs of < 0.29 which while I don't have numbers to back me on are probably a majority of sensu installs so this should not be done lightly and will require at least 1 and in fair number of cases 2 breaking changes to every single plugin.

What this means for Sensu admins

• Remember to always pin your Sensu system and your gems with specific versions
• Be aware that 0.29 and above use Ruby 2.4 and plugins need to be compatible with this version
• If you want to contribute please checkout Test ruby install time with 2.4.1 on all repos #27, Test runtime with ruby 2.4 on all repos #29 and reach out to a maintainer if you have questions (@majormoses @eheydrick @mbbroberg)

EDIT: we should pin sensu-plugin to ~> 2.5 to pull in the latest and greatest.

[majormoses]

• sensu-plugins-ansible
• sensu-plugins-apache
• sensu-plugins-aws
• sensu-plugins-beanstalk
• sensu-plugins-bigpanda
• sensu-plugins-bluepill
• sensu-plugins-campfire
• sensu-plugins-cassandra
• sensu-plugins-ceph
• sensu-plugins-cgroups
• sensu-plugins-chatwork
• sensu-plugins-chef
• sensu-plugins-clockworksms
• sensu-plugins-conntrack
• sensu-plugins-consul
• sensu-plugins-couchbase
• sensu-plugins-couchdb
• sensu-plugins-cpu-checks
• sensu-plugins-cucumber
• sensu-plugins-dashing
• sensu-plugins-datadog
• sensu-plugins-dcos
• sensu-plugins-dhcp
• sensu-plugins-disk-checks
• sensu-plugins-dns
• sensu-plugins-docker
• sensu-plugins-dovecot
• sensu-plugins-eep
• sensu-plugins-elasticsearch
• sensu-plugins-entropy-checks
• sensu-plugins-environmental-checks
• sensu-plugins-erlang
• sensu-plugins-etcd
• sensu-plugins-execute
• sensu-plugins-eye
• sensu-plugins-feature-requests
• sensu-plugins-filesystem-checks
• sensu-plugins-flowdock
• sensu-plugins-fluentd
• sensu-plugins-freeradius
• sensu-plugins-ftp
• sensu-plugins-gearman
• sensu-plugins-geckoboard
• sensu-plugins-gelf
• sensu-plugins-github
• sensu-plugins-gluster
• sensu-plugins-golang
• sensu-plugins-google-spreadsheet
• sensu-plugins-gpg
• sensu-plugins-graphite
• sensu-plugins-graylog
• sensu-plugins-growthforecast
• sensu-plugins-haproxy
• sensu-plugins-hardware
• sensu-plugins-hbase
• sensu-plugins-hipchat
• sensu-plugins-http
• sensu-plugins-hubot
• sensu-plugins-icecast
• sensu-plugins-iis
• sensu-plugins-imap
• sensu-plugins-imkayac
• sensu-plugins-influxdb
• sensu-plugins-io-checks
• sensu-plugins-ipmi
• sensu-plugins-ipvs
• sensu-plugins-irc
• sensu-plugins-java
• sensu-plugins-jenkins
• sensu-plugins-jolokia
• sensu-plugins-kannel
• sensu-plugins-kegbot
• sensu-plugins-kubernetes
• sensu-plugins-ldap
• sensu-plugins-librato
• sensu-plugins-load-checks
• sensu-plugins-logs
• sensu-plugins-logstash
• sensu-plugins-lvm
• sensu-plugins-lxc
• sensu-plugins-mackerel
• sensu-plugins-mailer
• sensu-plugins-mailgun
• sensu-plugins-memcached
• sensu-plugins-memory-checks
• sensu-plugins-mesos
• sensu-plugins-messagemedia
• sensu-plugins-mongodb
• sensu-plugins-monit
• sensu-plugins-mysql
• sensu-plugins-nbzget
• sensu-plugins-netscaler
• sensu-plugins-network-checks
• sensu-plugins-newrelic
• sensu-plugins-nginx
• sensu-plugins-nrpe
• sensu-plugins-ntp
• sensu-plugins-nvidia
• sensu-plugins-officehours
• sensu-plugins-openldap
• sensu-plugins-openstack
• sensu-plugins-opentsdb
• sensu-plugins-openvpn
• sensu-plugins-opsgenie
• sensu-plugins-pacemaker
• sensu-plugins-pagerduty
• sensu-plugins-percona
• sensu-plugins-php-fpm
• sensu-plugins-pingdom
• sensu-plugins-ponymailer
• sensu-plugins-postfix
• sensu-plugins-postgres
• sensu-plugins-process-checks
• sensu-plugins-puma
• sensu-plugins-puppet
• sensu-plugins-pushover
• sensu-plugins-qmail
• sensu-plugins-rabbitmq
• sensu-plugins-raid-checks
• sensu-plugins-redis
• sensu-plugins-request-tracker
• sensu-plugins-resque
• sensu-plugins-rethinkdb
• sensu-plugins-riak
• sensu-plugins-riemann
• sensu-plugins-rspec
• sensu-plugins-selinux
• sensu-plugins-sensu
• sensu-plugins-sentry
• sensu-plugins-serverspec
• sensu-plugins-sftp
• sensu-plugins-sidekiq
• sensu-plugins-signifai
• sensu-plugins-sip
• sensu-plugins-skel
• sensu-plugins-skyline
• sensu-plugins-slack
• sensu-plugins-sms
• sensu-plugins-snmp
• sensu-plugins-solr
• sensu-plugins-splunk
• sensu-plugins-springboot
• sensu-plugins-ssl
• sensu-plugins-statuspage
• sensu-plugins-strongswan
• sensu-plugins-supervisor
• sensu-plugins-switchvox
• sensu-plugins-syslog-ng
• sensu-plugins-telapi
• sensu-plugins-telegram
• sensu-plugins-tempodb
• sensu-plugins-tomcat
• sensu-plugins-trafficserver
• sensu-plugins-tripwire
• sensu-plugins-twemproxy
• sensu-plugins-twilio
• sensu-plugins-twitter
• sensu-plugins-ubiquiti
• sensu-plugins-uchiwa
• sensu-plugins-unicorn
• sensu-plugins-ups
• sensu-plugins-uptime-checks
• sensu-plugins-varnish
• sensu-plugins-victorops
• sensu-plugins-vmstats
• sensu-plugins-vsphere
• sensu-plugins-windows
• sensu-plugins-wordpress
• sensu-plugins-xen
• sensu-plugins-xmpp
• sensu-plugins-zendesk
• sensu-plugins-zookeeper