Stanford dosa merge WIP/drop datadog from stage

Another wip commit resolving problems installing the util stack. Also,
remove datadog from staging hosts where it's not needed.

playbooks/edx-west/stage-all.yml

 ---
-- hosts: tag_environment_stage:!tag_function_nat
+- name: Common configuration for all staging hosts
   # exclude nat host b/c we can't log in anyway
-  #- hosts: tag_Name_bastion_stage
+  hosts: tag_environment_stage:!tag_function_nat
   sudo: True
   vars:
     secure_dir: ../../../edx-secret/ansible
@@ -10,7 +10,6 @@
     - "{{ secure_dir }}/vars/edxapp_stage_vars.yml"
     - "{{ secure_dir }}/vars/users.yml"
     - "{{ secure_dir }}/vars/edxapp_stage_users.yml"
-    - "{{ secure_dir }}/vars/datadog_stage.yml"
   roles:
     - common
     - supervisor

playbooks/edx-west/stage-jumpbox.yml

-- hosts: tag_Name_jumpbox_stage
+- name: Set up staging jumpbox
+  hosts: tag_Name_jumpbox_stage
   sudo: True
   vars_files:
     - "{{ secure_dir }}/vars/users_jumpbox.yml"
-    - "{{ secure_dir }}/vars/datadog_stage.yml"
   vars:
     secure_dir: '../../../configuration-secure/ansible'
     local_dir:  '../../../configuration-secure/ansible/local'
   roles:
     - common
-    - datadog

playbooks/edx-west/stage-log.yml

@@ -2,10 +2,8 @@
   sudo: True
   vars_files:
     - "{{ secure_dir }}/vars/users_jumpbox.yml"
-    - "{{ secure_dir }}/vars/datadog_stage.yml"
   vars:
     secure_dir: '../../../configuration-secure/ansible'
     local_dir:  '../../../configuration-secure/ansible/local'
   roles:
     - common
-    - datadog

playbooks/edx-west/stage-ora.yml

@@ -8,7 +8,6 @@
   vars_files:
     - "{{ secure_dir }}/vars/ora_stage_vars.yml"
     - "{{ secure_dir }}/vars/edxapp_stage_users.yml"
-    - "{{ secure_dir }}/vars/datadog_stage.yml"
   roles:
     - common
     - supervisor
@@ -16,5 +15,4 @@
       nginx_sites:
       - ora
     - ora
-    - datadog
     #- splunkforwarder

playbooks/roles/edxapp/tasks/deploy.yml

@@ -93,7 +93,7 @@
 # Substitute github mirror in all requirements files
 - name: Updating requirement files for git mirror
   command: |
-    /bin/sed -i -e 's/github\.com/{{ GIT_MIRROR }}/g' {{ item }}
+    /bin/sed -i -e 's/github\.com/{{ COMMON_GIT_MIRROR }}/g' {{ item }}
   with_items:
     - "{{ base_requirements_file }}"
     - "{{ pre_requirements_file }}"
@@ -206,7 +206,7 @@
 - name: Install sandbox requirements into sandbox venv
   shell: >
     cd {{ edxapp_app_dir }} &&
-    {{ EDXAPP_SANDBOX_VENV_DIR }}/bin/pip install -i {{ PYPI_MIRROR_URL }} --exists-action w --use-mirrors
+    {{ EDXAPP_SANDBOX_VENV_DIR }}/bin/pip install -i {{ COMMON_PYPI_MIRROR_URL }} --exists-action w --use-mirrors
     --upgrade --no-deps -r {{ item }}
   with_items:
   - "{{ sandbox_base_requirements }}"