reset to master

Signed-off-by: runzexia <runzexia@yunify.com>

vendor/code.cloudfoundry.org/bytefmt/README.md

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+bytefmt
+=======
+
+**Note**: This repository should be imported as `code.cloudfoundry.org/bytefmt`.
+
+Human-readable byte formatter.
+
+Example:
+
+```go
+bytefmt.ByteSize(100.5*bytefmt.MEGABYTE) // returns "100.5M"
+bytefmt.ByteSize(uint64(1024)) // returns "1K"
+```
+
+For documentation, please see http://godoc.org/code.cloudfoundry.org/bytefmt