Export refactoring 1: Merged methods _copydisk and _export for efficiency in adding a disk section to the OVF.
Export refactoring 1: Merged methods _copydisk and _export for efficiency in adding a disk section to the OVF.

Signed-off-by: Konstantina Chremmou <a7d1f757a659045fb6db8c1e3849a1c8ad00b97a@citrix.com>

kc284/xenadmin,xenserver/xenadmin,xenserver/xenadmin,xenserver/xenadmin,kc284/xenadmin,kc284/xenadmin,kc284/xenadmin,kc284/xenadmin