Fixing the build to run python tests

[Hal Murray]

> The cause of this issue is that the python libraries are stored in  pylib/
> but installed (and referenced in the code) as ntp/. Previously  this caused
> import problems that were solved when someone added code to  create a
> symlink from ntp/ to pylib/ at the end of the build process.  

That link lets you test python code using the new libraries.

In a previous version of that code, the link was in ntpclients and you could 
run things by cd-ing there.  Now the link is in $build/main/ntpclients so you 
have to cd there.  Are you doing that?



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