Fix config validation (apply to 0.228)

[darrenfu]

== RELEASE NOTES ==

General Changes
* Fix config validation in v0.228. Based on JSR 303, validation should be applied on getter methods only. This fix will move all setter-side javax validation annotations to getter methods. This applies to all three Config Bean files.

Reference:

• JSR 303 official link
• JSR 303 bean validation - Why on getter and not setter discussion link
• Errors without this fix

[linux-foundation-easycla]

The committers are authorized under a signed CLA.

• ✅ Darren F (6f6ba62)