Stop deleting 'format.json' upon unsuccessful save (#5747)
Stop deleting 'format.json' upon unsuccessful save (#5747)

An issue was reproduced when there a no more inodes
available on an existing setup of 4 disks, now we
took one of the disks and reformatted it to relinquish
inodes. Now we attempt to bring the fresh disk back
into setup and perform a heal - at this point creating
new `format.json` fails on existing disks since they
do not have more inodes available.

At this point due to quorum failure, we end up deleting
existing `format.json` as well, this PR removes the code
which deletes existing `format.json` as there is no need
to delete them.
aead/minio,jimjag/minio,balamurugana/minio,krishnasrinivas/minio,vadmeste/minio,jimjag/minio,harshavardhana/minio,minio/minio,abperiasamy/minio,krisis/minio,aead/minio,aead/minio,harshavardhana/minio,donatello/minio,harshavardhana/minio,minio/minio,krishnasrinivas/minio,harshavardhana/minio,harshavardhana/minio,fwessels/minio,fwessels/minio,aead/minio,harshavardhana/minio,NitishT/minio,abperiasamy/minio,fwessels/minio,balamurugana/minio,fwessels/minio,NitishT/minio,krishnasrinivas/minio,aead/minio,NitishT/minio,jimjag/minio,harshavardhana/minio,abperiasamy/minio,harshavardhana/minio,krishnasrinivas/minio,aead/minio,vadmeste/minio,abperiasamy/minio,NitishT/minio,donatello/minio,aead/minio,aead/minio,krisis/minio,jimjag/minio