Multiple ingress with same secret Fixes #298

[ebati]

Fixes #298

• Created constructor function for ingress.Tls which extracts required info from k8s.tls.
• Added ability to add host to Tls.
• Changed TlsIgnoreDuplicatedSecrets to accept secret referenced from multiple ingress. But merge hosts from those ingresses.

[jetstack-bot]

Hi @ebati. Thanks for your PR.

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