MFC 1.50:
MFC 1.50:

- Bump _yplib_timeout limit from 10 to 20 seconds to better handle
  packet loss when talking to a NIS server.
- Set 1 second retry timeout to further realistically handle UDP
  packet loss for yp_next packet bursts.  If the packet hasn't come
  back within 1 second its rather unlikely to come back at all.  There
  is still back-off mechanism in RPC so if there is another reason
  than packet loss for the lack of response within 1 second, the NIS
  server will not be totally bombarded with requests.

This reduces the risk of NIS failing with:

	yp_next: clnt_call: RPC: Timed out

considerably.  This is mainly a problem if you have larger NIS maps
(like at FreeBSD.org) since enumerations of the lists will cause a UDP
packet bursts where a few packets being lost once in a while do
happen.

Discussed with: peter
Problem mainly diagnosed by:    peter

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