Fix PATH for kubeadm init

Right now we're consistently getting warnings about kubelet not found in
path during `kubeadm init`. We fixed this for `kubeadm join` in #3342, and this brings the change to init
as well.

roles/kubernetes/master/tasks/kubeadm-setup.yml

@@ -108,6 +108,8 @@
   retries: 3
   when: inventory_hostname == groups['kube-master']|first and not kubeadm_already_run.stat.exists
   failed_when: kubeadm_init.rc != 0 and "field is immutable" not in kubeadm_init.stderr
+  environment:
+    PATH: "{{ bin_dir }}:{{ ansible_env.PATH }}"
   notify: Master | restart kubelet
 
 - name: slurp kubeadm certs
@@ -155,6 +157,8 @@
   until: kubeadm_init is succeeded or "field is immutable" in kubeadm_init.stderr
   when: inventory_hostname != groups['kube-master']|first and not kubeadm_already_run.stat.exists
   failed_when: kubeadm_init.rc != 0 and "field is immutable" not in kubeadm_init.stderr
+  environment:
+    PATH: "{{ bin_dir }}:{{ ansible_env.PATH }}"
   notify: Master | restart kubelet
 
 - name: kubeadm | upgrage kubernetes cluster