fix: apiserver broken due to incorrect kms cachesize setting

[andyzhangx]

Reason for Change:

fix: apiserver broken due to incorrect kms cachesize
When enabling KMS feature on aks-engine, apiserver could not start up due to incorrect kms cachesize

original error is like following:

I0222 14:21:26.635590       1 services.go:51] Setting service IP to "10.0.0.1" (read-write).
I0222 14:21:26.635604       1 server.go:596] external host was not specified, using 10.255.255.5
I0222 14:21:26.635609       1 server.go:639] Initializing cache sizes based on 0MB limit
I0222 14:21:26.635886       1 server.go:150] Version: v1.18.0-alpha.5
Error: error while parsing encryption provider configuration file "/etc/kubernetes/encryption-config.yaml": error while parsing file: resources[0].providers[0].kms.cachesize: Invalid value: 0: cachesize should be a positive value, or negative to disable
Usage:

Issue Fixed:

Requirements:

• uses conventional commit messages
• includes documentation
• adds unit tests
• tested upgrade from previous version

Notes:

[andyzhangx]

/azp run pr-e2e

[azure-pipelines]

Azure Pipelines successfully started running 1 pipeline(s).

[codecov]

Codecov Report

Merging #2769 into master will not change coverage.
The diff coverage is n/a.

@@           Coverage Diff           @@
##           master    #2769   +/-   ##
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  Coverage   72.35%   72.35%           
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  Files         137      137           
  Lines       25341    25341           
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  Hits        18335    18335           
  Misses       5949     5949           
  Partials     1057     1057

[jackfrancis]

@ritazh could you code review this?

[ritazh]

LGTM

[acs-bot]

[APPROVALNOTIFIER] This PR is APPROVED

This pull-request has been approved by: andyzhangx, ritazh

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[andyzhangx]

cc @sauryadas