CP-9370:Add network type and more error message for resource list report feature

Add network type column to network table
Add memory usage ratio to VM and Host tables
Add detail error message in exporting report

Signed-off-by: Cheng Zhang <cheng.zhang@citrix.com>
Listing the network type is a good addition.

The "guest installer network" should be hidden, as it used to be in some code which is deleted in this changeset.

If you create a "single server private network" in XenCenter, it should show up as Messages.INTERNAL_NETWORK here: at the moment it is not matching any of them, so just gets a hyphen.