Bump ansible to latest 2.5 version

This is the same version run by zuul.

Update devstack callback for ansible 2.5.

Change-Id: Ic0d2559346570e60025838166b9bd0081eee331a
Signed-off-by: Paul Belanger <pabelanger@redhat.com>

devstack-vm-gate-wrap.sh

@@ -28,7 +28,7 @@ GIT_BRANCH=${GIT_BRANCH:-master}
 # We're using enough ansible specific features that it's extremely
 # possible that new ansible releases can break us. As such we should
 # be very deliberate about which ansible we use.
-ANSIBLE_VERSION=${ANSIBLE_VERSION:-2.3.2.0}
+ANSIBLE_VERSION=${ANSIBLE_VERSION:-2.5.7}
 export DSTOOLS_VERSION=${DSTOOLS_VERSION:-0.4.0}
 
 # sshd may have been compiled with a default path excluding */sbin

playbooks/plugins/callback/devstack.py

@@ -22,7 +22,7 @@ from __future__ import print_function
 
 from ansible import constants as C
 from ansible.plugins.callback import CallbackBase
-from ansible.vars import strip_internal_keys
+from ansible.plugins.callback import strip_internal_keys
 
 import datetime
 import yaml