Ansible 2.3 support

- Fix when clauses in various places
- Update requirements.txt
- Fix README.md

Signed-off-by: Sergii Golovatiuk <sgolovatiuk@mirantis.com>

add MY_NODE_NAME variable into netchecker-agent environment

Specify a dir and attach it to helm for HELM_HOME

add some known tweaks that need to be made for coreos to docs

allow for correct aws default resolver

Change DNS policy for kubernetes components

When VPC is used, external DNS might not be available. This patch change
behavior to use metadata service instead of external DNS when
upstream_dns_servers is not specified.

Signed-off-by: Sergii Golovatiuk <sgolovatiuk@mirantis.com>

According to code apiserver, scheduler, controller-manager, proxy don't
use resolution of objects they created. It's not harmful to change
policy to have external resolver.

Signed-off-by: Sergii Golovatiuk <sgolovatiuk@mirantis.com>

Move namespace file to template directory

Explicitly create cni bin dir

Fix IPS array variable expansion

Add tags to reset playbook and make iptables flush optional

kubernetesUnitPrefix was changed to k8s_* in 1.5. This patch reflects
this change in kargo

Fixes #1229

Add minimal k8s upgrade playbook

Remove and ignore .bak files

If this path doesnt exist, it will cause kubelet to fail to start when
using rkt

$IPS only expands to the first ip address in the array:

justin@box:~$ declare -a IPS=(10.10.1.3 10.10.1.4 10.10.1.5)
justin@box:~$ echo $IPS
10.10.1.3
justin@box:~$ echo ${IPS[@]}
10.10.1.3 10.10.1.4 10.10.1.5

add ability for custom flags

allow admission control plug-ins to be easily customized

Skip vault cert task evaluation when using script certs

Updating calico versions

Reschedule netchecker-server in case of HW failure.

Fixes for AWS Terraform Deployment and Updated Readme

Update upgrades.md