Issue#364: UI - Column Resizing Function Broken in Host Tab

It doesn't work when resizing columns in a page containing multiple
Grid instances.
  Fix it in this patch.

Signed-off-by: Hongliang Wang <hlwang@linux.vnet.ibm.com>
Host Tab: Add Widths for Repository Grid Columns

Added CSS width values for repository grid.

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