Be resilient to restoring unintelligible network templates

Some OEMs have introduced incompatible network bookkeeping.  We now
detect and ignore those network definitions at restore time.

In addition, we now

  * log when an undefined network match type is used to construct a
    NetworkTemplate instance, and
  * quietly refuse to match such a NetworkTemplate against any known
    network identifier, rather than crashing the inquiring app.

Bug 38151335
Test: manual

Change-Id: I565b6f6b87df1f13a8c0c01ae6049bda270b1e48