[MERGE] selftest: use SymlinkFeature instead of TestSkipped where appropriate

[John Arbash Meinel]

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Alexander Belchenko wrote:
> These changes are mostly mechanical.
> 
> Alexander
> 

BB:tweak
         if getattr(os, 'mkfifo', None) is None:
- -            # TODO: Ultimately this should be TestSkipped
- -            # or PlatformDeficiency
- -            return
+            raise TestSkipped('OS does not support mkfifo')

^- I think we want a comment that this should be an 'UnavailableFeature'

+        raise TestSkipped('pycurl do not check HTTP_PROXY '
+            'for security reasons')

^- This should be: pycurl does not ...

(including in the nearby comment.)


The rest looks good.

John
=:->
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