Cmake. Removed unused script.

[dsazonoff]

I forgot to remove Fetch_gRPC.cmake file in #803
It is not used anymore.
@devjgm could you do a review, please?

[devjgm]

It doesn't appear to be used anymore, so removing LGTM. I have no authority in this repo, so I'm not sure if my approval means anything :-)

[agones-bot]

Build Succeeded 👏

Build Id: dfbaa636-decf-48e4-8d09-af9de09b9017

The following development artifacts have been built, and will exist for the next 30 days:

• image: gcr.io/agones-images/agones-controller:0.12.0-fc7ad8a
• image: gcr.io/agones-images/agones-sdk:0.12.0-fc7ad8a
• image: gcr.io/agones-images/agones-ping:0.12.0-fc7ad8a
• Linux C++ SDK (build): agonessdk-0.12.0-fc7ad8a-linux-arch_64.tar.gz
• SDK Server: agonessdk-server-0.12.0-fc7ad8a.zip

A preview of the website (the last 30 builds are retained):

• https://fc7ad8a-dot-preview-dot-agones-images.appspot.com/

To install this version:

• git fetch https://github.com/GoogleCloudPlatform/agones.git pull/907/head:pr_907 && git checkout pr_907
• helm install install/helm/agones --namespace agones-system --name agones --set agones.image.tag=0.12.0-fc7ad8a

[roberthbailey]

/lgtm

/assign @markmandel for approval and merge.

[cyriltovena]

LGTM

[agones-bot]

Build Failed 😱

Build Id: 8ad74941-06d3-42ec-a1f9-886927d771bb

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• Cloud Build log download

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[agones-bot]

Build Failed 😱

Build Id: 92ebd363-227c-4802-8e7f-35eb206defcf

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[agones-bot]

Build Failed 😱

Build Id: a2bfc15e-c769-4d1f-84e2-cd6f829da44e

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[agones-bot]

Build Succeeded 👏

Build Id: 65ce3a86-c932-47c2-85dd-0c0c3a219744

The following development artifacts have been built, and will exist for the next 30 days:

• image: gcr.io/agones-images/agones-controller:0.12.0-6f00a0f
• image: gcr.io/agones-images/agones-sdk:0.12.0-6f00a0f
• image: gcr.io/agones-images/agones-ping:0.12.0-6f00a0f
• Linux C++ SDK (build): agonessdk-0.12.0-6f00a0f-linux-arch_64.tar.gz
• SDK Server: agonessdk-server-0.12.0-6f00a0f.zip

A preview of the website (the last 30 builds are retained):

• https://6f00a0f-dot-preview-dot-agones-images.appspot.com/

To install this version:

• git fetch https://github.com/GoogleCloudPlatform/agones.git pull/907/head:pr_907 && git checkout pr_907
• helm install install/helm/agones --namespace agones-system --name agones --set agones.image.tag=0.12.0-6f00a0f