startup: do not start minio server if port is not free. Fixes #1207
startup: do not start minio server if port is not free. Fixes #1207

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