Merge pull request #4451 from edx/aali/OPS-2950_remove_datadog_agent

remove datadog agents

playbooks/roles/datadog-uninstall/defaults/main.yml

+datadog_uninstall_agent_version: '1:5.10.1-1'
+datadog_uninstall_apt_key: "0x382E94DE"
+DATADOG_UNINSTALL_UBUNTU_APT_KEYSERVER: "http://keyserver.ubuntu.com/pks/lookup?op=get&fingerprint=on&search="

playbooks/roles/datadog-uninstall/tasks/main.yml

+---
+- name: Remove apt key for datadog
+  apt_key:
+    id: "382E94DE"
+    url: "{{ DATADOG_UNINSTALL_UBUNTU_APT_KEYSERVER }}{{ common_datadog_apt_key }}"
+    state: absent
+
+- name: Uninstall apt repository for datadog
+  apt_repository:
+    repo: 'deb http://apt.datadoghq.com/ stable main'
+    state: absent
+
+
+- name: Uninstall datadog agent
+  apt:
+    name: "datadog-agent={{ common_datadog_agent_version }}"
+    state: absent