[ansible] fix some places for Ansible 2.2

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

ironic_staging_drivers/ansible/playbooks/add-ironic-nodes.yaml

@@ -4,8 +4,8 @@
     - add_host:
         group: ironic
         hostname: "{{ item.name }}"
-        ansible_ssh_host: "{{ item.ip }}"
-        ansible_ssh_user: "{{ item.user }}"
+        ansible_host: "{{ item.ip }}"
+        ansible_user: "{{ item.user }}"
         ironic_extra: "{{ item.extra | default({}) }}"
       with_items: "{{ ironic_nodes }}"
       tags: always

ironic_staging_drivers/ansible/playbooks/ansible.cfg

@@ -1,19 +1,30 @@
 [defaults]
 # retries through the ansible-deploy driver are not supported
 retry_files_enabled = False
+
 # this is using supplied callback_plugin to interleave ansible event logs
 # into Ironic-conductor log as set in ironic configuration file,
 # see callback_plugin/ironic_log.ini for some options to set
 # (DevStack _needs_ some tweaks)
 callback_whitelist = ironic_log
+
 # For better security, bake SSH host keys into bootstrap image,
 # add those to ~/.ssh/known_hosts for user running ironic-conductor service
 # on all nodes where ironic-conductor and ansible-deploy driver are installed,
 # and set the host_key_checking to True (or comment it out, it is the default)
 host_key_checking = False
+
 # uncomment if you have problem with ramdisk locale on ansible >= 2.1
 #module_set_locale=False
 
+# This sets the interval (in seconds) of Ansible internal processes polling
+# each other. Lower values improve performance with large playbooks at
+# the expense of extra CPU load. Higher values are more suitable for Ansible
+# usage in automation scenarios, when UI responsiveness is not required but
+# CPU usage might be a concern.
+# Default corresponds to the value hardcoded in Ansible ≤ 2.1:
+#internal_poll_interval = 0.001
+
 [ssh_connection]
 # pipelining greatly increases speed of deployment, disable it only when
 # your version of ssh client on ironic node or server in bootstrap image

ironic_staging_drivers/ansible/playbooks/callback_plugins/ironic_log.py

@@ -16,11 +16,14 @@ import os
 
 from oslo_config import cfg
 from oslo_log import log as logging
+import pbr.version
 
-from ironic.common import i18n
-from ironic import version
+from ironic_staging_drivers.common import i18n
 
+CONF = cfg.CONF
+DOMAIN = 'ironic'
 
+# parse callback plugin config and Ironic config, setup logging
 basename = os.path.splitext(__file__)[0]
 config = ConfigParser.ConfigParser()
 ironic_config = None
@@ -34,21 +37,20 @@ try:
 except Exception:
     pass
 
-CONF = cfg.CONF
-DOMAIN = 'ironic'
+version_info = pbr.version.VersionInfo(DOMAIN)
+
 LOG = logging.getLogger(__name__, project=DOMAIN,
-                        version=version.version_info.release_string())
+                        version=version_info.release_string())
 logging.register_options(CONF)
 
 conf_kwargs = dict(args=[], project=DOMAIN,
-                   version=version.version_info.release_string())
+                   version=version_info.release_string())
 if ironic_config:
     conf_kwargs['default_config_files'] = [ironic_config]
 CONF(**conf_kwargs)
 
 if ironic_log_file:
     CONF.set_override("log_file", ironic_log_file)
-CONF.set_override("use_stderr", False)
 
 logging.setup(CONF, DOMAIN)