Merge "increase number of open files for collectd"

diff --cc ansible/install_collectd.yml
index 16021b7,7b82915..637c42d
--- 1/ansible/install_collectd.yml
--- 2/ansible/install_collectd.yml
+++ b/ansible/install_collectd.yml
@@@ -15,9 -15,10 +15,11 @@@
  - hosts: all
    vars:
      clone_dir: /tmp/yardstick-clone
 +  environment: "{{ proxy_env|default({}) }}"
  
    roles:
+     # needed for collectd plugins
+     - increase_open_file_limits
      # build shared DPDK for collectd only, required DPDK downloaded already
      - role: download_dpdk
      - install_dpdk_shared