[handler] fix regression in api_request for Ruby >= 2.0

Comparing the arguments for `Net::HTTPGenericRequest` on
[1.9.1](https://ruby-doc.org/stdlib-1.9.1/libdoc/net/http/rdoc/Net/HTTPGenericRequest.html)
vs
[2.3.0](https://ruby-doc.org/stdlib-2.3.0/libdoc/net/http/rdoc/Net/HTTPGenericRequest.html),
I see that 1.9.1 expects argument `path` where as 2.3.0 takes `uri_or_path`
argument. If the `uri_or_path` is not a `URI` object, it is treated as the path.

I believe we can unconditionally pass the value of  `uri.path` to
`net_http_req_class(method).new` on both ruby 1.9 and 2.x, as the hostname, port
and scheme are explicitly set when calling `Net::HTTP.start`.

Closes sensu-plugins/sensu-plugins-sensu#18
Closes #160
Closes #161

CHANGELOG.md

@@ -4,6 +4,9 @@ This project adheres to [Semantic Versioning](http://semver.org/).
 
 ## [Unreleased]
 
+- Fixed a regression in Sensu::Handler `api_request` method, introduced in
+  v1.4.3, which broke silence stashes and check dependencies on Ruby 2.x.
+
 ## [v1.4.3] - 2016-10-04
 
 - Fixed an incompatibility with Ruby 1.9 introduced in Sensu::Handler api_request circa sensu-plugin 1.3.0

lib/sensu-handler.rb

@@ -133,7 +133,7 @@ def api_request(method, path, &blk)
       end
       domain = api_settings['host'].start_with?('http') ? api_settings['host'] : 'http://' + api_settings['host']
       uri = URI("#{domain}:#{api_settings['port']}#{path}")
-      req = net_http_req_class(method).new(uri.to_s)
+      req = net_http_req_class(method).new(uri.path)
       if api_settings['user'] && api_settings['password']
         req.basic_auth(api_settings['user'], api_settings['password'])
       end