[Bug 367531]

[Adam Dane]

Created attachment 573692
Implements offline-mode with respect for loopback.

This doesn't give network zones, but it does rework offline mode to let
loopback stay live.

It's not completely network-silent, as DNS requests are still attempted
(and succeed if the network is available).  Suggestions welcome.

The changes:

 + nsIOService no longer shuts down DNS and the socket service when
going offline, it only does that on shutdown.  Needs a few more changes,
about what observers to notify and when.

 + nsHttpChannel no longer allows only cached pages to load.  Non-local
pages in cache should still load from cache.

 + nsSocketTransport2 will now balk (with NS_ERROR_OFFLINE) if offline
and the address isn't loopback.

 + nsHttpHandler now observes the NS_IOSERVICE_GOING_OFFLINE_TOPIC and
clears existing connections (otherwise, after going offline you could
load pages only from domains with reusable connections).  This was not
needed for FTP, as it already did that.  Not sure, but probably will be
needed for websockets?

 + NSPRPUB's PR_IsNetAddrType() needed to modify its checks for IPv4
loopback prefix rather than for just the typical address of 127.0.0.1

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https://bugs.launchpad.net/bugs/367531

Title:
  firefox should be smarter about offline access

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