Use fdwalk and implement wrapper for platforms not having it
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                 Key: TS-372
                 URL: https://issues.apache.org/jira/browse/TS-372
             Project: Traffic Server
          Issue Type: Improvement
          Components: Core
            Reporter: Mladen Turk
            Assignee: Mladen Turk
            Priority: Minor
             Fix For: 2.1.1
         Attachments: fdwalk.diff

Implement fdwalk for common iteration over opened process file descriptors
Solaris has native fdwalk function, so implement the same on other platforms 
using ink_fdwalk.

This feature allow to close all opened file descriptors in process using using 
simple callback
which is something usually done after fork and before execv.



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