remove older deploymentID fix behavior to speed up startup (#19497)

since mid 2018 we do not have any deployments
without deployment-id, it is time to put this
code to rest, this PR removes this old code as
its no longer valuable.

on setups with 1000's of drives these are all
quite expensive operations.

cmd/storage-interface.go

@@ -108,5 +108,4 @@ type StorageAPI interface {
 	// Read all.
 	ReadAll(ctx context.Context, volume string, path string) (buf []byte, err error)
 	GetDiskLoc() (poolIdx, setIdx, diskIdx int) // Retrieve location indexes.
-	SetFormatData(b []byte)                     // Set formatData cached value
 }