Update Ubuntu ami to latest version

[moshevayner]

Following @olemarkus's comment on issue #10184, I noticed that ubuntu has a more recent version to their AMI.
This update is for alpha channel, within a week or so we can push it to stable if everything's good.

$ aws ec2 describe-images --region us-east-1 --output table \
>     --owners 099720109477 \
>     --query "sort_by(Images, &CreationDate)[*].[CreationDate,Name,ImageId]" \
>     --filters "Name=name,Values=ubuntu/images/hvm-ssd/ubuntu-focal-20.04-amd64-*"
-------------------------------------------------------------------------------------------------------------------------
|                                                    DescribeImages                                                     |
+--------------------------+------------------------------------------------------------------+-------------------------+
|  2020-04-23T11:35:02.000Z|  ubuntu/images/hvm-ssd/ubuntu-focal-20.04-amd64-server-20200423  |  ami-068663a3c619dd892  |
|  2020-05-29T01:38:58.000Z|  ubuntu/images/hvm-ssd/ubuntu-focal-20.04-amd64-server-20200528  |  ami-0e2512bd9da751ea8  |
|  2020-06-10T01:14:00.000Z|  ubuntu/images/hvm-ssd/ubuntu-focal-20.04-amd64-server-20200609  |  ami-02ae530dacc099fc9  |
|  2020-06-26T16:09:27.000Z|  ubuntu/images/hvm-ssd/ubuntu-focal-20.04-amd64-server-20200625  |  ami-0c40fbd26b9ac0da9  |
|  2020-07-02T03:19:54.000Z|  ubuntu/images/hvm-ssd/ubuntu-focal-20.04-amd64-server-20200701  |  ami-04e7b4117bb0488e4  |
|  2020-07-16T19:18:04.000Z|  ubuntu/images/hvm-ssd/ubuntu-focal-20.04-amd64-server-20200716  |  ami-0d57c0143330e1fa7  |
|  2020-07-21T00:35:15.000Z|  ubuntu/images/hvm-ssd/ubuntu-focal-20.04-amd64-server-20200720  |  ami-06c8ff16263f3db59  |
|  2020-07-30T15:39:28.000Z|  ubuntu/images/hvm-ssd/ubuntu-focal-20.04-amd64-server-20200729  |  ami-0758470213bdd23b1  |
|  2020-08-18T17:26:37.000Z|  ubuntu/images/hvm-ssd/ubuntu-focal-20.04-amd64-server-20200817  |  ami-05cf2c352da0bfb2e  |
|  2020-09-04T22:45:42.000Z|  ubuntu/images/hvm-ssd/ubuntu-focal-20.04-amd64-server-20200903  |  ami-03f6f0014076ab3c5  |
|  2020-09-08T00:55:25.000Z|  ubuntu/images/hvm-ssd/ubuntu-focal-20.04-amd64-server-20200907  |  ami-0dba2cb6798deb6d8  |
|  2020-09-17T16:23:49.000Z|  ubuntu/images/hvm-ssd/ubuntu-focal-20.04-amd64-server-20200916  |  ami-030bb5fda5f7e1896  |
|  2020-09-25T01:16:05.000Z|  ubuntu/images/hvm-ssd/ubuntu-focal-20.04-amd64-server-20200924  |  ami-0c43b23f011ba5061  |
|  2020-10-14T16:38:23.000Z|  ubuntu/images/hvm-ssd/ubuntu-focal-20.04-amd64-server-20201014  |  ami-07bfe0a3ec9dfcffa  |
|  2020-10-27T01:01:48.000Z|  ubuntu/images/hvm-ssd/ubuntu-focal-20.04-amd64-server-20201026  |  ami-0885b1f6bd170450c  |
+--------------------------+------------------------------------------------------------------+-------------------------+

[hakman]

@MoShitrit I checked and the only image available in AWS GovCloud and AWS China is the 20201014 one. Let's keep the current one for another 2-3 weeks and see if things change there, or we add some separate logic for those.
https://cloud-images.ubuntu.com/locator/ec2/

[moshevayner]

/hold

[hakman]

Thanks :)

[moshevayner]

@hakman I just take another look at the website you sent and seems like the 20201026 release is now available everywhere, so we should be good to move forward with this, right?

[hakman]

Totally agree. Please add it to stable also. I already tested and works well.

[moshevayner]

/hold cancel

[hakman]

Thanks @MoShitrit .
/lgtm
/approve

[k8s-ci-robot]

[APPROVALNOTIFIER] This PR is APPROVED

This pull-request has been approved by: hakman, MoShitrit

The full list of commands accepted by this bot can be found here.

The pull request process is described here

Needs approval from an approver in each of these files:

• OWNERS [hakman]

Approvers can indicate their approval by writing /approve in a comment
Approvers can cancel approval by writing /approve cancel in a comment