erasure: read only dataBlocks if we have enough. (#1776)
erasure: read only dataBlocks if we have enough. (#1776)

Reconstruct with parity blocks if we don't have enough data blocks.
vadmeste/minio,harshavardhana/minio,rushenn/minio,fwessels/minio,fwessels/minio,abperiasamy/minio,harshavardhana/minio,aead/minio,aead/minio,harshavardhana/minio,minio/minio,krisis/minio,alexellis/minio,hackintoshrao/minio,mkash32/minio,mkash32/minio,dutchcoders/minio,harshavardhana/minio,NitishT/minio,luomeiqin/minio,dvstate/minio,balamurugana/minio,abperiasamy/minio,jimjag/minio,brendanashworth/minio,harshavardhana/minio,alexellis/minio,NitishT/minio,aead/minio,vadmeste/minio,hackintoshrao/minio,brendanashworth/minio,aead/minio,rushenn/minio,dutchcoders/minio,dutchcoders/minio,krishnasrinivas/minio-daily,mf-00/newgo,fwessels/minio,dvstate/minio,luomeiqin/minio,donatello/minio,brendanashworth/minio,brendanashworth/minio,hackintoshrao/minio,hackintoshrao/minio,krishnasrinivas/minio,aead/minio,krishnasrinivas/minio,dvstate/minio,dvstate/minio,dutchcoders/minio,NitishT/minio,luomeiqin/minio,fwessels/minio,harshavardhana/minio,koolhead17/minio,jimjag/minio,krishnasrinivas/minio,donatello/minio,minio/minio,harshavardhana/minio,koolhead17/minio,jimjag/minio,krisis/minio,rushenn/minio,krishnasrinivas/minio-daily,jimjag/minio,abperiasamy/minio,NitishT/minio,krishnasrinivas/minio,aead/minio,balamurugana/minio,abperiasamy/minio,aead/minio,rushenn/minio,mf-00/newgo,aead/minio,luomeiqin/minio,harshavardhana/minio