Jans Config Api - Ability to turn off oauth2 security

[pujavs]

Requirement.

Clients have requested ability to turn off oauth2 security validation for jans-config-api so that they can leverage their existing security gateway

Client Req: https://support.gluu.org/other/9916/remove-security-to-consume-config-api/

Implementation:

• Added new config boolean attribute configOauthEnabled. By default the value is true which indicates that Config oauth2 is enabled and will be used to validate Api security
• During setup client can specify the value as false to indicate that Config oauth2 is turned off
• Existing client will have to modify the value manually in DB

[pujavs]

Code merged into master