fs: Correct human-readable output alignment

fs: Correct human-readable output alignment

'fs lq' output separates its space values by whitespace, but 'fs df'
does not, which was causing the human-readable output for 'fs' to not
be properly aligned with the output headers. Modify HumanPrintSpace to
take up exactly 10 characters (9 for the value, 1 for the exponent),
and have the callers print out an extra space if appropriate.

Change-Id: Ied81e73e1e84df34e63fdf0c80ad86341bea0cd4
Reviewed-on: http://gerrit.openafs.org/2311
Reviewed-by: Derrick Brashear <shadow@dementia.org>
Tested-by: Derrick Brashear <shadow@dementia.org>