Apply OAuth 2.0 newly provided from Spring Security 5.0

[yoshikawaa]

Description

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Now TERASOLUNA supports Spring Security OAuth (spring-security-oauth2), which is already deprecated. You should switch to OAuth 2.0 function newly provided from Spring Security 5.0.

Possible Solution

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Affect versions

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• 5.x.x.RELEASE

Issue links

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• #xx