Observe mOwnerUID in NetworkCapabilities#equals.

Currently, NetworkCapabilities's equals and hashCode methods
ignore mOwnerUID. This is confusing because it is inconsistent
with pretty much every other member of this class.

Bug: 175188445
Test: atest CtsNetTestCases:NetworkAgentTest \
            CtsNetTestCases:Ikev2VpnTest \
	    CtsNetTestCases:VpnServiceTest HostsideVpnTests \
	    CtsNetTestCases:android.net.cts.ConnectivityDiagnosticsManagerTest \
	    ConnectivityServiceTest com.android.server.connectivity.VpnTest
Change-Id: I2348b7a35f32a931687f2d3c2fa57620a12fe06f