tcpmib.InSeg probe point needs some default functions

[William Cohen]

I was looking through the test results for the systemtap.examples and found that following command used to determine whether the test should run doesn't work for systemtap.examples/network/tcpipstat.stp:

   stap -l 'tcpmib.InSegs'

Looking through the tapset found that it expect a couple functions to be available. The attached patch adds those functions in a separate file so the user can overide the functions. If there are no objects about the patch I will check it in.

    Include default tcpmib_filter_key and ipmib_filter_key functions in tapset

    The tcpmib.InSegs probe point in the tcpmib.stp tapset makes uses
    of the tcpmib_filter_key() and the ipmib_filter_key() functions.
    Without these default functions the "stap -l 'tcpmib.InSegs'"
    command does not work.


-Will
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