Define helper function virDomainInterfaceFree, which allows
the upper layer application to free the domain interface object
conveniently.
The API is going to provide multiple methods by flags, e.g.
* Query guest agent
* Parse DHCP lease file
include/libvirt/libvirt-domain.h
* Define virDomainInterfaceAddresses, virDomainInterfaceFree
* Define structs virDomainInterface, virDomainIPAddress
src/driver-hypervisor.h:
* Define domainInterfaceAddresses
src/libvirt-domain.c:
* Implement virDomainInterfaceAddresses
* Implement virDomainInterfaceFree
src/libvirt_public.syms:
* Export the new symbols
Signed-off-by: Nehal J Wani <nehaljw.kkd1@gmail.com>
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