Fix fleetautoscalers webhook TLS policy

[aLekSer]

There was an issue with not setting RootCA certs.

What type of PR is this?

Uncomment only one /kind <> line, hit enter to put that in a new line, and remove leading whitespace from that line:

/kind breaking

/kind bug

What this PR does / Why we need it:

Which issue(s) this PR fixes:
Closes #1734

Special notes for your reviewer:
We don't need SystemRootCA as we want to allow only one CertificateAuthority to sign clients certificates for FleetAutoscalers Webhooks.
In the future we could add mTLS support.

[rorygarand]

@aLekSer thank you for taking a look at this so quickly!

[agones-bot]

Build Failed 😱

Build Id: 4fac3b91-ce3d-4375-949f-ff9908b853d6

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[aLekSer]

Error connected with hugo bug :

	"RELEASE_VERSION=1.8.0 RELEASE_BRANCH=master hugo --config=config.toml -F"
fatal error: concurrent map read and map write

goroutine 238 [running]:
runtime.throw(0x1e2fd5a, 0x21)
	/usr/local/go/src/runtime/panic.go:1116 +0x72 fp=0xc001fe8878 sp=0xc001fe8848 pc=0x4f1712
runtime.mapaccess1_faststr(0x1b27300, 0xc000c63650, 0xc000cc67e2, 0x1c, 0x23691c0)

[aLekSer]

Tested locally:

  ----     ------            ----                ----                        -------
  Warning  FailedGetFleet    69s (x3 over 117s)  fleetautoscaler-controller  could not fetch fleet: simple-udp
  Normal   AutoScalingFleet  9s                  fleetautoscaler-controller  Scaling fleet simple-udp from 2 to 4
by-it00060:crt23 alexander$ kubectl describe fleetautoscaler

[agones-bot]

Build Succeeded 👏

Build Id: 40f27c77-f4bc-4c3c-a512-dad0894570b0

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

• image: gcr.io/agones-images/agones-controller:1.8.0-2e606d4
• image: gcr.io/agones-images/agones-sdk:1.8.0-2e606d4
• image: gcr.io/agones-images/agones-ping:1.8.0-2e606d4
• Linux C++ SDK (build): agonessdk-1.8.0-2e606d4-linux-arch_64.tar.gz
• SDK Server: agonessdk-server-1.8.0-2e606d4.zip

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

• https://2e606d4-dot-preview-dot-agones-images.appspot.com/

To install this version:

• git fetch https://github.com/googleforgames/agones.git pull/1736/head:pr_1736 && git checkout pr_1736
• helm install ./install/helm/agones --namespace agones-system --name agones --set agones.image.tag=1.8.0-2e606d4

[markmandel]

I see the issue now! Good find!

[google-oss-robot]

[APPROVALNOTIFIER] This PR is APPROVED

This pull-request has been approved by: aLekSer, markmandel

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[google-oss-robot]

New changes are detected. LGTM label has been removed.

[agones-bot]

Build Succeeded 👏

Build Id: eb986f04-02ab-4c87-a9e0-d475977ae4a1

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

• image: gcr.io/agones-images/agones-controller:1.8.0-79e5bd5
• image: gcr.io/agones-images/agones-sdk:1.8.0-79e5bd5
• image: gcr.io/agones-images/agones-ping:1.8.0-79e5bd5
• Linux C++ SDK (build): agonessdk-1.8.0-79e5bd5-linux-arch_64.tar.gz
• SDK Server: agonessdk-server-1.8.0-79e5bd5.zip

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

• https://79e5bd5-dot-preview-dot-agones-images.appspot.com/

To install this version:

• git fetch https://github.com/googleforgames/agones.git pull/1736/head:pr_1736 && git checkout pr_1736
• helm install ./install/helm/agones --namespace agones-system --name agones --set agones.image.tag=1.8.0-79e5bd5