Update metadata and add PRR

Author: ehashman

keps/prod-readiness/sig-node/2400.yaml

@@ -0,0 +1,3 @@
+kep-number: 2400
+alpha:
+  approver: "@deads2k"

keps/sig-node/2400-node-swap/kep.yaml

@@ -6,15 +6,18 @@ authors:
 owning-sig: sig-node
 participating-sigs:
   - sig-node
-status: provisional
+status: implementable
 creation-date: 2021-04-06
 reviewers:
-  - TBD
+  - "@SergeyKanzhelev"
+  - "@anguslees"
+  - "@deads2k"
+  - "@sftim"
 approvers:
   - "@derekwaynecarr"
   - "@dchen1107"
 prr-approvers:
-  - "@johnbelamaric"
+  - "@deads2k"
 
 # The target maturity stage in the current dev cycle for this KEP.
 stage: alpha