Add etcd proxy support

* Enforce a etcd-proxy role to a k8s-cluster group members. This
provides an HA layout for all of the k8s cluster internal clients.
* Proxies to be run on each node in the group as a separate etcd
instances with a readwrite proxy mode and listen the given endpoint,
which is either the access_ip:2379 or the localhost:2379.
* A notion for the 'kube_etcd_multiaccess' is: ignore endpoints and
loadbalancers and use the etcd members IPs as a comma-separated
list. Otherwise, clients shall use the local endpoint provided by a
etcd-proxy instances on each etcd node. A Netwroking plugins always
use that access mode.
* Fix apiserver's etcd servers args to use the etcd_access_endpoint.
* Fix networking plugins flannel/calico to use the etcd_endpoint.
* Fix name env var for non masters to be set as well.
* Fix etcd_client_url was not used anywhere and other etcd_* facts
evaluation was duplicated in a few places.
* Define proxy modes only in the env file, if not a master. Del
an automatic proxy mode decisions for etcd nodes in init/unit scripts.
* Use Wants= instead of Requires= as "This is the recommended way to
hook start-up of one unit to the start-up of another unit"
* Make apiserver/calico Wants= etcd-proxy to keep it always up

Signed-off-by: Bogdan Dobrelya <bdobrelia@mirantis.com>
Co-authored-by: Matthew Mosesohn <mmosesohn@mirantis.com>

roles/network_plugin/calico/tasks/main.yml

@@ -44,7 +44,7 @@
 
 - name: Calico | Check if calico network pool has already been configured
   uri:
-    url: "http://127.0.0.1:2379/v2/keys/calico/v1/ipam/v4/pool"
+    url: "{{ etcd_endpoint }}/v2/keys/calico/v1/ipam/v4/pool"
     return_content: yes
     status_code: 200,404
   register: calico_conf
@@ -70,7 +70,7 @@
 
 - name: Calico | Get calico configuration from etcd
   uri:
-    url: "http://127.0.0.1:2379/v2/keys/calico/v1/ipam/v4/pool"
+    url: "{{ etcd_endpoint }}/v2/keys/calico/v1/ipam/v4/pool"
     return_content: yes
   register: calico_pools
   run_once: true