Uses identical hostName across all interface

In case a host has two interfaces (e.g. wifi and ethernet) that are
bridged on the router side, hosts on the network would receive service
advertisements for both interfaces. If each interface uses a different
hostname, this creates a problem where service SRV records would point
to two different hostnames. Generating a hostname for all interfaces can
fix this problem. The hostname will be regenerated if all the clients
for NsdService are disconnected.

Test: atest FrameworksNetTests CtsNetTestCases
Bug: 268153179
Change-Id: Icdd2991233729b7f90e65984ca0381e32ab4ce93