gather_perf_info: Fix Playbook

Ensure elasticsearch Python SDK is installed globally.

Delegate reporting to DuT compute.

Change-Id: Ifea7b843baeab1e7c809f9c0046434e577a5475b
(cherry picked from commit 9b7c7a3)

Author: vkhitrin

playbooks/packet_gen/trex/gather_perf_info.yml

@@ -65,7 +65,7 @@
           command: ovs-vswitchd --version
           register: compute_ovs_versions
 
-      delegate_to: "{{ groups['compute'][0] }}"
+      delegate_to: "{{ dut_compute if dut_compute else 'none' }}"
 
     - name: upload_result_to_elk
       include_role:

roles/packet_gen/trex/upload_results_to_elk/tasks/main.yml

@@ -9,6 +9,9 @@
 - name: install elasticsearch pip
   pip:
     name: elasticsearch=={{ elasticsearch_pip_version }}
+  become: true
 
 - name: upload results to elasticsearch
   script: upload_to_ELK.py --upload -p /tmp/{{ dut_type }}_perf_info.json
+  args:
+    executable: python3