shell: Used path resolve method created previously

The path resolve utility method was created in when the run command was
migrated (287b014).

Signed-off-by: Or Cohen <orc@fewbytes.com>
shell: Add file completion to md5sum

Signed-off-by: Or Cohen <orc@fewbytes.com>
shell: Use utility method for completion

Signed-off-by: Or Cohen <orc@fewbytes.com>