Ignore potential SystemProperties errors when setting net.dns

Test: as follows
    - built
    - flashed
    - booted
    - "runtest frameworks-net" passes
Bug: 33308258
Bug: 36249702

Change-Id: I76ae853ceb61b7b900f36f9c3cd67b2d2284aab0
1 file changed
tree: eefc3161f6543df80c712a998f3c8afabe49a2e9
  1. core/
  2. services/
  3. tests/