Merge pull request #4385 from edx/schen/veda_splunk_integration

Add a new playbook to just install splunk forwarder

playbooks/edx-east/splunkforwarder.yml

+- name: Install Splunk Forwarder
+  hosts: all
+  become: True
+  gather_facts: True
+  roles:
+    - splunkforwarder