Add istio host annotation

[ukclivecox]

What this PR does / why we need it:

Allows the istio host to be specified for VirtualService creation

Which issue(s) this PR fixes:

Fixes #3137

Special notes for your reviewer:

Does this PR introduce a user-facing change?:

[review-notebook-app]

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[seldondev]

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[ukclivecox]

/test notebooks

[ukclivecox]

/test integration

[ukclivecox]

/test notebooks

[ukclivecox]

/test integration

[ukclivecox]

/test notebooks

[axsaucedo]

Looks good! Should be good go - the notebook tests have been fixed in master as well so after rebasing should be able to rerun.

[ukclivecox]

/test integration

[ukclivecox]

/test notebooks

[ukclivecox]

/test integration

[ukclivecox]

/test notebooks

[ukclivecox]

/test integration

[axsaucedo]

/test integration

[axsaucedo]

/test integration

[axsaucedo]

Seems flaky tests failure
/test integration

[axsaucedo]

It seems flaky test now passes, so looks good - merging