webadmin : Fixed rendering issue in DetailsRenderer

Fixed rendering issue in DetailsRenderer

Earlier the units of size were not displayed for host memory.
With this patch the units of host memory are displayed.

Bug-Url: https://bugzilla.redhat.com/1049892
Change-Id: I49662e7e367889516d0667f27b801927bd0a1357
Signed-off-by: Anmol Babu <anbabu@redhat.com>