XL/fs: Return saved content-type during GetObject
XL/fs: Return saved content-type during GetObject

Fixes #1674

abperiasamy/minio,rushenn/minio,harshavardhana/minio,balamurugana/minio,fwessels/minio,fwessels/minio,donatello/minio,luomeiqin/minio,dutchcoders/minio,abperiasamy/minio,koolhead17/minio,mf-00/newgo,krishnasrinivas/minio-daily,NitishT/minio,aead/minio,harshavardhana/minio,krishnasrinivas/minio,harshavardhana/minio,fwessels/minio,NitishT/minio,rushenn/minio,krishnasrinivas/minio-daily,donatello/minio,hackintoshrao/minio,krisis/minio,rushenn/minio,jimjag/minio,jimjag/minio,aead/minio,harshavardhana/minio,aead/minio,brendanashworth/minio,harshavardhana/minio,harshavardhana/minio,dvstate/minio,dvstate/minio,aead/minio,mf-00/newgo,aead/minio,aead/minio,krisis/minio,dutchcoders/minio,alexellis/minio,abperiasamy/minio,fwessels/minio,brendanashworth/minio,NitishT/minio,jimjag/minio,alexellis/minio,krishnasrinivas/minio,brendanashworth/minio,minio/minio,vadmeste/minio,NitishT/minio,krishnasrinivas/minio,minio/minio,brendanashworth/minio,hackintoshrao/minio,dvstate/minio,dutchcoders/minio,krishnasrinivas/minio,luomeiqin/minio,harshavardhana/minio,hackintoshrao/minio,hackintoshrao/minio,vadmeste/minio,luomeiqin/minio,dvstate/minio,abperiasamy/minio,koolhead17/minio,luomeiqin/minio,aead/minio,mkash32/minio,jimjag/minio,aead/minio,balamurugana/minio,rushenn/minio,dutchcoders/minio,harshavardhana/minio,mkash32/minio