change the unit of host disk and net IO rate from kb/s to B/s

Now UI calls changetoProperUnit to get the proper unit.
This patch just changes the unit of host disk and net IO rate.

And the unit is B/s
ref: http://en.wikipedia.org/wiki/Bit_rate.

Signed-off-by: ShaoHe Feng <shaohef@linux.vnet.ibm.com>
Issue #235: changetoProperUnit Returns Wrong Result

1) I expect 0.12B for the following call:
  kimchi.changetoProperUnit(0.123456789, 2);

  though it returns 0.123456789B.

  This patch fixes this issue.

2) Added a parameter base to support network I/O rate
    (1000 instead of 1024).

Signed-off-by: Hongliang Wang <hlwang@linux.vnet.ibm.com>
UI: Host Monitoring

Includes following features:
a) View system basic information;
b) Monitor host dynamic data including:
   CPU, Memory, Disk I/O, Network I/O.
c) Generate/Remove/Download SOS report;
d) Stop/Restart/Connect To host.

Signed-off-by: Hongliang Wang <hlwang@linux.vnet.ibm.com>