Changed DNSLookup to fallback to using local nameservers if NS queries fail

Ignore-this: ae4071a178f86b7d3f260180b94020b

darcs-hash:20100218103321-1e3d8-5f0ac35d259d3c9e7d3aafd534dd37917f31735e
Fix assertion error during ICE negotiation

Ignore-this: db77f716bf4a520f8426503a7cd035a7

darcs-hash:20100216165038-56b4d-662de7194ff02e662521ab3083a8af344a5e7628