Fixing a bug to support using json files in the bulk loader

[gitlw]

This change is 

[gitlw]

Fixes #3462

[martinmr]

Reviewable status: 0 of 1 files reviewed, 2 unresolved discussions (waiting on @gitlw and @manishrjain)

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dgraph/cmd/bulk/run.go, line 100 at r1 (raw file):

func ensureExists(file string) {
	if _, err := os.Stat(file); err != nil && os.IsNotExist(err) {
		fmt.Fprintf(os.Stderr, "Path(%v) does not exist.\n", file)

nit: add a space after Path

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dgraph/cmd/bulk/run.go, line 145 at r1 (raw file):

		os.Exit(1)
	case opt.RDFDir != "" && opt.JSONDir != "":
		fmt.Fprintf(os.Stderr, "Invalid flags: only one of rdfs(%q) of jsons(%q) may be specified.\n",

While you are fixing this file, can you fix this error message? I think it should say:

		fmt.Fprintf(os.Stderr, "Invalid flags: only one of rdfs (%q) or jsons (%q) may be specified.\n",
			opt.RDFDir, opt.JSONDir)