ATF tests still failing to complete within 2 hours on amd64

[Paul Goyette <paul%whooppee.com@localhost>]

A couple of network-related tests now seem to require more than five 
minutes per test case, and I'm suspecting that there are others that are 
taking significantly more time than they used to.  A complete test run 
used to take about 100 minutes - my last successful complete pass was a 
few days ago, on 2011-11-19 at 18:50:05 UTC

From the latest pass, I have

...
lib/librumphijack/t_tcpip (394/493): 4 test cases
    http: Failed: atf-check failed; see the output of the test for details
    nfs: Failed: Test case timed out after 300 seconds
    nfs_autoload: Skipped: test currently valid only on i386
    ssh: Failed: atf-check failed; see the output of the test for details
...
usr.sbin/traceroute/t_traceroute (460/493): 2 test cases
    basic: Failed: Test case timed out after 300 seconds
    basic_icmp:

At this point the entire test run times out.


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