Fix resolvconf executable discovery

If resolvconf was installed and then removed, the file
/etc/resolvconf/resolv.conf.d/head remains in the filesystem

- change discovery of 'resolvconf' executable to check if it
  can be located with 'which resolvconf' command or not.

Collect ansible logs as artifacts

Extends https://github.com/kubespray/kargo/pull/406



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

Fix calico-node service unit

Add a diagnostic info collect playbook

Add option to disable ipv6 dns lookup

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

New variable disable_ipv6_dns in kubernetes/preinstall.

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

Check dnsmasq on first kube-node

kube-masters without kube-node role will not run
kube-proxy, and therefore can't check if dnsmasq
is running.

Fixes #368

Revert "Merge pull request #393 from bogdando/ci_changes"

This reverts commit 4662b41d, reversing
changes made to 4fb4ac12.

Improve systemd handling and stabilize docker

Add future docker versions

Fixes #390

Creating the unit using default settings early on
and then changing it during network_plugin section
leads to too many docker restarts and duplicated code.

Reversed Wants= dependence on docker.service so it does not
restart docker when reloading systemd

Consolidated all docker restart handlers.

Default version is still unchanged, but added docker versions 1.11 and 1.12

* Add for docker system units:
    ExecReload=/bin/kill -s HUP $MAINPID
    Delegate=yes
    KillMode=process.
* Add missed DOCKER_OPTIONS for calico/weave docker systemd unit.
* Change Requires= to a less strict and non-faily Wants=, add missing
  Wants= for After=.
* Align wants/after in a wat if Wants=foo, After= has foo as well.
* Make wants/after docker.service to ask for the docker.socket as well.
* Move "docker rm -f" commands from ExecStartPre= to ExecStopPost=.
  hooks to ensure non-destructive start attempts issued by Wants=.

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

Add CI test layouts

* Drop Trusty from test matrix
* Add extra cases to test separate roles deployment

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

Fix weave deployment task names

Support --ipip option for calico pool

Add settable flannel image tag & image repo

Fix etcd restart and calico-node unit

Changed Wants=docker.service to docker.socket

Renamed handlers for reloading systemd to contain role in task name.

Fix etcd user for etcd-proxy service

Only affects sys V OSes (Ubuntu 14.04)

Fixes ##383

Fix etcd standalone deployment

Add HA/LB endpoints for kube-apiserver

etcd facts are generated in kubernetes/preinstall, so etcd nodes need
to be evaluated first before the rest of the deployment.

Moved several directory facts from kubernetes/node to
kubernetes/preinstall because they are not backward dependent.

Copy kubectl from docker container

* Add HA docs for API server.
* Add auto-evaluated internal endpoints and clarify the loadbalancer_apiserver
vars and usecases.
* Use facts for kube_apiserver to not repeat code and enable LB endpoints use.
* Use /healthz check for the wait-for apiserver.
* Use the single endpoint for kubelet instead of the list of apiservers
* Specify kube_apiserver_count to for HA layout

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

Nearly the last stage of source all components to containers.
Kubectl will be called from hyperkube image.

Remaining tasks:
 * Move kube_version variable to kubernetes/preinstall
 * Drop placeholder download.nothing requirement

Deploy kubelet and kube-apiserver as containers

kubelet via docker
kube-apiserver as a static pod

Fixed etcd service start to be more tolerant of slow start.

Workaround for kube_version to stay in download role, but not
download an files by creating a new "nothing" download entry.