Upgrade to KEDA 2.0

[tomkerkhove]

No description provided.

[asipras]

@tomkerkhove @TsuyoshiUshio I can help with this upgrade effort.

I went through the code last weekend and will try to set up dev env. this coming weekend.

Is there anything quite obvious I need to consider when upgrading this project for Keda 2.0? Your tips/pointers @TsuyoshiUshio can really speed things up on this.

[TsuyoshiUshio]

Thank you. Since I have no bandwidth for this update, I really appreciate your contribution. I don't have any tips, I included all asset on this repo. However, if you got stuck, ping me!