Changes include:
- callback plugin - fixed for Ansible 2.2
Apparently now `eventlet.monkey_patch()` breaks Ansible,
and since it is implicitly executed on any import from ironic package,
it breaks the callback plugin and the whole ansible-deploy driver
when using Ansible 2.2.
Instead, just copy-paste those several lines of code explicitly
into callback plugin module or use them from ironic_staging_drivers
code.
- ansible.cfg - add interprocess polling interval option.
Increasing it should decrease CPU load generated by each
ansible-playbook invocation and improve ironic-conductor performance
for parallel deployment of nodes with ansible-deploy driver
- in-memory inventory playbook - changed add_host module args to
correspond to Ansible 2.x
Change-Id: I365a82cd3592a7669599fe84674ca4abab8f576f
Closes-Bug: #1652326
c3f02d1d2f