XL: Do not rely on getLoadBalancedQuorumDisks for NS consistency. (#2243)

The reason is any function relying on `getLoadBalancedQuorumDisks`
cannot possibly have an idempotent behavior.

The problem comes from given a set of N disks returning just a
shuffled N/2 disks.  In case of a scenario where we have N/2
number of failed disks, the returned value of `getLoadBalancedQuorumDisks`
is not equal to the same failed disks so essentially calls using such
disks might succeed or fail randomly at different intervals in time.

This proposal change is we move to `getLoadBalancedDisks()`
and use the shuffled N disks as a whole. Since most of the time we might
hit a good disk since we are not reducing our solution space. This
also provides consistent behavior for all the functions which rely
on shuffled disks.

Fixes #2242

xl-v1-metadata.go

@@ -230,7 +230,7 @@ var objMetadataOpIgnoredErrs = []error{
 // readXLMetadata - returns the object metadata `xl.json` content from
 // one of the disks picked at random.
 func (xl xlObjects) readXLMetadata(bucket, object string) (xlMeta xlMetaV1, err error) {
-	for _, disk := range xl.getLoadBalancedQuorumDisks() {
+	for _, disk := range xl.getLoadBalancedDisks() {
 		if disk == nil {
 			continue
 		}