Move ipconfig file inside apex data directory

In order to support rollbacks, the ethernet ipconfig file needs to be
written to the data apex's data directory. We still need to support
reading from the legacy location to be backwards compatible.

If the apex file path already exists, then read the IP configuration
from there directly, otherwise, check if the legacy file path exists,
if yes, read the legacy IP configuration and copy it to the new apex
file path.

Support for default IpConfiguration is also being removed in this CL.
The default IpConfiguration (configuration entry for interface "0")
was a way to transition from supporting a single interface to
supporting multiple interfaces and was introduced in P. Every device
that has used such a configuration and has connected to an ethernet
network since upgrading to P+ has already removed the "0" config and
has assigned it to the first interface (probably "eth0"). There has
never been an API to set this, but if someone wanted to install a
default IpConfiguration, they could just configure "eth0" instead.

Bug: 224919694
Test: atest EthernetConfigStoreTest --iterations
Test: manually test
      - adb push <fake ipconfig.txt> /data/misc/ethernet/
      - adb reboot
      - read the IP config from legacy path and the same config
        file is created in the apex file path
      - adb reboot
      - read the IP config from the apex file path directly
Change-Id: Ifb82a5d7fa13d17ea8fd3a42a19cd020cb95e26a
(cherry picked from commit 47641d75d991a26e8616a239b717021810dee798)
Merged-In: Ifb82a5d7fa13d17ea8fd3a42a19cd020cb95e26a

0 files changed, 0 insertions, 0 deletions