Update Ubuntu 16.04 -> Ubuntu 22.04 (#270)

* Update Ubuntu 16.04 -> Ubuntu 22.04

Azure pipelines were failing because 16.04 no longer exists.

* Use ddtrace 1.0.

* fix

* fix ffi

* fix

* fix ffi

* Fix ffi

* Support ruby 2.4

* fix

.azure-pipelines/all.yml

@@ -32,7 +32,7 @@ resources:
 jobs:
 - job: UnitTests
   pool:
-    vmImage: "Ubuntu-16.04"
+    vmImage: "Ubuntu-22.04"
   container:
     image: ruby:$(RUBY_VERSION)
     options: >-
@@ -72,7 +72,7 @@ jobs:
         DD_TRACE_ANALYTICS_ENABLED: "true"
 - job: TestRuby19
   pool:
-    vmImage: "Ubuntu-16.04"
+    vmImage: "Ubuntu-22.04"
   steps:
     # Until the `container` AZP resource supports being root in a container https://github.com/microsoft/azure-pipelines-agent/issues/2619 we need this long single line approach
     # By default AZP clones the repo into a folder called `s` - https://docs.microsoft.com/en-us/azure/devops/pipelines/repos/pipeline-options-for-git?view=azure-devops#checkout-path

.rubocop.yml

@@ -1,3 +1,5 @@
+inherit_from: .rubocop_todo.yml
+
 # This configuration was generated by
 # `rubocop --auto-gen-config`
 # on 2016-08-15 12:22:34 -0400 using RuboCop version 0.42.0.
@@ -17,5 +19,3 @@ Metrics/ModuleLength:
 # Our Client constructor has 8 arguments
 Metrics/ParameterLists:
   Enabled: false
-
-inherit_from: .rubocop_todo.yml