"else omit" is causing problems in this expression. Replacing
it with more strict "inventory_hostname" fixes the issue and
handles `download_run_once` as expected.

Closes issue #514

Correct nslookup command

Add more DNS docs

Copy hyperkube CNI plugins when using weave

Add Docker 1.12.1 version

Signed-off-by: Bogdan Dobrelya <bdobrelia@mirantis.com>

Change nslookup command to check the right cluster_name

Adjust DNS picture

Reflect changes made to DNS setup

Signed-off-by: Bogdan Dobrelya <bdobrelia@mirantis.com>

Fix docs and dns servers placement order

- Update docs and a drawing to clarify DNS setup.
- Change order of nameservers placement to match
  changes in https://github.com/kubespray/kargo/pull/501



Signed-off-by: Bogdan Dobrelya <bdobrelia@mirantis.com>

Make dnsmasq daemon set optional

Change additional dnsmasq opts:
- Adjust caching size and TTL
- Disable resolve conf to not create loops
- Change dnsPolicy to default (similarly to kubedns's dnsmasq). The
  ClusterFirst should not be used to not create loops
- Disable negative NXDOMAIN replies to be cached
- Make its very installation as optional step (enabled by default).
  If you don't want more than 3 DNS servers, including 1 for K8s, disable
  it.
- Add docs and a drawing to clarify DNS setup.
- Fix stdout logs for dnsmasq/kubedns app configs
- Add missed notifies to resolvconf -u handler
- Fix idempotency of resolvconf head file changes

Signed-off-by: Bogdan Dobrelya <bdobrelia@mirantis.com>

Improve management of nameservers in resolv.conf

Changing nameservers now will clean up previous entries

Changed ImagePullPolicy from Always to IfNotPresent to avoid download…

Rename large-deploymets.md to large-deployments.md

Filename was a typo

Fix reverse DNS lookups of service IPs.

always bind etcd_proxy to localhost

Add socat do required pkgs

switch /etc/hosts to use blockinfile

This fixes "DNS should provide DNS for services [Conformance]"
e2e test in k8s.

Fix use_hyperkube_cni logic

Signed-off-by: Bogdan Dobrelya <bdobrelia@mirantis.com>

Distribute container images across nodes

* Add the retry_stagger var to tweak push and retry time strategies.
* Add large deployments related docs.

Signed-off-by: Bogdan Dobrelya <bdobrelia@mirantis.com>

Signed-off-by: Bogdan Dobrelya <bdobrelia@mirantis.com>

Move version/repo vars to download role.
Add container to download params, which overrides url/source_url,
if enabled.
Fix networking plugins download depending on kube_network_plugin.

Signed-off-by: Bogdan Dobrelya <bdobrelia@mirantis.com>

Fix logic handling for use_hyperkube_cni

It's required for port forwarding.

Added IntelliJ IDEA Project folder to .gitignore

Fix kubedns idempotency