deploy: remove imagePullPolicy for livenessprobe

Just as for the other containers the image is immutable and therefore
doesn't have to be checked all the time. Required for CI testing,
because it uses an image that is only available locally.

Author: pohly

deploy/kubernetes-1.13/hostpath/csi-hostpath-plugin.yaml

@@ -101,7 +101,6 @@ spec:
               name: plugins-dir
 
         - name: liveness-probe
-          imagePullPolicy: Always
           volumeMounts:
           - mountPath: /csi
             name: socket-dir

deploy/master/hostpath/csi-hostpath-plugin.yaml

@@ -101,7 +101,6 @@ spec:
               name: plugins-dir
 
         - name: liveness-probe
-          imagePullPolicy: Always
           volumeMounts:
           - mountPath: /csi
             name: socket-dir