Cherry-pick changes from 1.0 - Fix deployment namespace #7446 (#7477)

[ericvn]

Cherrypicked commit:

Signed-off-by: Sébastien Prud'homme sebastien.prudhomme@gmail.com

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[ericvn]

@sebastien-prudhomme Are you OK with me cherry picking the changes forward to master and release-1.1? Asking to get the required CLA sign-off.

[ericvn]

First portion of #13625

[ericvn]

/assign @ayj

[istio-testing]

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

Test name	Commit	Details	Rerun command
prow/istio-integ-k8s-tests.sh	87c3a1f	link	/test istio-integ-k8s-tests

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[ozevren]

/lgtm

[istio-testing]

[APPROVALNOTIFIER] This PR is APPROVED

This pull-request has been approved by: ericvn, ozevren

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[ericvn]

Closing this PR as I can see that the change made it into the new installer code.