John Hay b4fbe18794 Various fixes to make leased line operation more robust. On lcp_up, start
to negotiate from scratch. Make leased lines survive being put into
loopback mode. Bits and pieces and ideas taken from PRs 11238 and 21771.
Make it a module so that it can be kldloaded. Whitespace cleanup. (Can be
ignored with "cvs diff -b".)

PR:		11238 and 21771 (bits and pieces)
2000-12-19 19:08:11 +00:00
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