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-apps/ansible/templates/netchecker-agent-ds.yml

@@ -23,3 +23,10 @@ spec:
             - name: REPORT_INTERVAL
               value: '{{ agent_report_interval }}'
           imagePullPolicy: {{ k8s_image_pull_policy }}
+          resources:
+            limits:
+              cpu: {{ netchecker_agent_cpu_limit }}
+              memory: {{ netchecker_agent_memory_limit }}
+            requests:
+              cpu: {{ netchecker_agent_cpu_requests }}
+              memory: {{ netchecker_agent_memory_requests }}