Fix chicken and egg problem with proxy_env not defined on the first …

[alexkross]

…envinronment usage.

What type of PR is this?

/kind api-change

/kind bug

/kind cleanup
/kind design
/kind documentation
/kind failing-test
/kind feature
/kind flake

What this PR does / why we need it:
Confguration with proxy defined fails.

Which issue(s) this PR fixes:
Errors on the first task that uses role: kubespray-defaults and have environment: "{{ proxy_env }}. Messages are meaningless:

PLAY [k8s-cluster:etcd] *****************************************************************************************************************************************************
Tuesday 07 April 2020  08:51:31 +0300 (0:00:01.332)       0:04:03.124 *********

TASK [Gathering Facts] ******************************************************************************************************************************************************
fatal: [i9kv1]: FAILED! => {"msg": "The field 'environment' has an invalid value, which includes an undefined variable. The error was: 'None' has no attribute 'get'"}
fatal: [i0k8s1-11]: FAILED! => {"msg": "The field 'environment' has an invalid value, which includes an undefined variable. The error was: 'None' has no attribute 'get'"}
fatal: [i0k8s1-12]: FAILED! => {"msg": "The field 'environment' has an invalid value, which includes an undefined variable. The error was: 'None' has no attribute 'get'"}
fatal: [i0k8s1-13]: FAILED! => {"msg": "The field 'environment' has an invalid value, which includes an undefined variable. The error was: 'None' has no attribute 'get'"}
fatal: [i0k8s1-15]: FAILED! => {"msg": "The field 'environment' has an invalid value, which includes an undefined variable. The error was: 'None' has no attribute 'get'"}
fatal: [i0k8s1-14]: FAILED! => {"msg": "The field 'environment' has an invalid value, which includes an undefined variable. The error was: 'None' has no attribute 'get'"}
fatal: [i0k8s1-16]: FAILED! => {"msg": "The field 'environment' has an invalid value, which includes an undefined variable. The error was: 'None' has no attribute 'get'"}

Fixes #

Special notes for your reviewer:
it's not the best solution, just works.

Does this PR introduce a user-facing change?:
NONE

[k8s-ci-robot]

Hi @alexkross. Thanks for your PR.

I'm waiting for a kubernetes-sigs member to verify that this patch is reasonable to test. If it is, they should reply with /ok-to-test on its own line. Until that is done, I will not automatically test new commits in this PR, but the usual testing commands by org members will still work. Regular contributors should join the org to skip this step.

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[alexkross]

/assign @ant31

[Miouge1]

Looks good to me.

/lgtm
/approve

[k8s-ci-robot]

[APPROVALNOTIFIER] This PR is APPROVED

This pull-request has been approved by: alexkross, Miouge1

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