Add a metric to track unresolved DNS hosts

minor cleanup of filter loading

Merge branch '2.1' of https://github.com/Netflix/zuul into 2.1

remove modules from build

Merge pull request Netflix#305 from ServiceArchitecture/zuulfilter-ad…

…d-trace-monitor

Add MonitoringHelper.initMocks() to ZuulFilter TestUnit, otherwise it…

Release of 1.3.0

- 56ba3ec: Fix for unit-test breakage due to admin.enabled property default changing
- d1e6834: Merge pull request Netflix#267 from Netflix/AdminPageFix
- ba227b4: Protect Admin Page

Merge pull request Netflix#258 from gzurowski/fix-overrides

Consistently use @OverRide annotation across all classes

Release of 1.2.2

- 48594dc: Merge pull request Netflix#225 from Netflix/issues/127
- 73d86bf: Fix for Netflix#127

Release of 1.2.1

- d084b1b: Change the default origin in zuul-simple-webapp to be http://httpbin.org as it's more useful for testing than the previous http://apache.org
- e5aaa55: Fix the asm mismatch errors when for gradle jettyRun task
- c4af3a0: Merge pull request Netflix#222 from mattnelson/daemon_threads
- bfe7e19: Updated Bintray API key
- af12f5b: Use daemon threads for filter pollers