honghaiz db8cf50c59 Fix two problems in network.cc:
1. It signals network changed events whenever there are more than one IP address in a network.
2. It does not signal network changed events if a network disconnects and connects again.
Also changed DumpNetworks for better debugging.

BUG=webrtc:5096

Review URL: https://codereview.webrtc.org/1421433003

Cr-Commit-Position: refs/heads/master@{#11107}
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