Fix sidecars not retrieving updated mesh networks configuration

[ymesika]

Fixes #11221

/assign @hzxuzhonghu

[hzxuzhonghu]

This is not complete, should also consider kube Controller.ranger update

[hzxuzhonghu]

/lgtm

[istio-testing]

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[istio-testing]

@ymesika: The following test failed, say /retest to rerun them all:

Test name	Commit	Details	Rerun command
prow/istio-pilot-multicluster-e2e.sh	0ce77ca	link	/test istio-pilot-multicluster-e2e

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