Imports of package sftpfs

PathSynopsis
github.com/pkg/sftpPackage sftp implements the SSH File Transfer Protocol as described in https://filezilla-project.org/specs/draft-ietf-secsh-filexfer-02.txt
github.com/spf13/afero
osPackage os provides a platform-independent interface to operating system functionality.
timePackage time provides functionality for measuring and displaying time.