Systemd units, limits, and bin path fixes

* Add restart for weave service unit
* Reuse docker_bin_dir everythere
* Limit systemd managed docker containers by CPU/RAM. Do not configure native
  systemd limits due to the lack of consensus in the kernel community
  requires out-of-tree kernel patches.

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

roles/kubernetes/master/templates/manifests/kube-apiserver.manifest.j2

@@ -12,6 +12,13 @@ spec:
   - name: kube-apiserver
     image: {{ hyperkube_image_repo }}:{{ hyperkube_image_tag }}
     imagePullPolicy: {{ k8s_image_pull_policy }}
+    resources:
+      limits:
+        cpu: {{ kube_apiserver_cpu_limit }}
+        memory: {{ kube_apiserver_memory_limit }}
+      requests:
+        cpu: {{ kube_apiserver_cpu_requests }}
+        memory: {{ kube_apiserver_memory_requests }}
     command:
     - /hyperkube
     - apiserver