[istio] fix: handle wildcard hosts in VirtualServices

[zirain]

What type of PR is this?

/kind bug

What this PR does / why we need it:

Which issue(s) this PR fixes:

Fixes #154

Does this PR introduce a user-facing change?:

[istio] allow & handle wildcard hosts in VirtualServices

[k8s-ci-robot]

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[k8s-ci-robot]

Hi @zirain. Thanks for your PR.

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[levikobi]

Thanks @zirain!

/ok-to-test
/cc @LiorLieberman @dpasiukevich

[dpasiukevich]

/lgtm
/approve

Thanks for the PR!

[dpasiukevich]

@LiorLieberman could you review & approve the PR? Thanks!

[LiorLieberman]

Thanks @zirain !
/approve
/lgtm

[k8s-ci-robot]

[APPROVALNOTIFIER] This PR is APPROVED

This pull-request has been approved by: dpasiukevich, LiorLieberman, zirain

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