Add toString in NetworkFactory.
Add toString in NetworkFactory.

Needed some additional logging to track down this bug
so add toString to capture the state.

bug:18569575
Change-Id: I4047b8f8797bac09bcff31e99d9cb117abb04df4

xorware/android_frameworks_base,xorware/android_frameworks_base,xorware/android_frameworks_base,xorware/android_frameworks_base,xorware/android_frameworks_base,xorware/android_frameworks_base