Network backend: Add ip,ip-addr context attribute
Network backend: Add ip,ip-addr context attribute

It will contain the IPv4 or IPv6 address of the IIO context if created
with the network backend.

Signed-off-by: Paul Cercueil <73d292422978d45c9eeef455bb1b24a0db453722@analog.com>

analogdevicesinc/libiio,analogdevicesinc/libiio,analogdevicesinc/libiio,analogdevicesinc/libiio