Get rtnetlink address information from netlink event instead of Netd.

This change also refactors IpClientIntegrationTest to apply the new
update of getting netlink address information from netlink events
instead of depending on the netd callback such as:
    - move mIsNetlinkEventParseEnabled parameterized value setup before
      making IpClient instance;
    - update isStablePrivacyAddress to get the correct address flags;
    - call waitForIdle to see if IpClient has seen the new addresses.

Bug: 163492391
Test: atest NetworkStackTests NetworkStackIntegrationTests
Change-Id: I6b37962a6e121a29b19c9f33f66d2380c2bccb97