Add new cts for @SystemApi in IpConfiguration. Bug: 139268426 Bug: 135998869 Test: atest android.net.cts.IpConfigurationTest Change-Id: I942791abbdccc10d0e2a0018339a2ee4f74c7645 Merged-In: I942791abbdccc10d0e2a0018339a2ee4f74c7645 (cherry picked from aosp/1171795)