BIND 10 #223: session.py and build directory path change

[BIND 10 Development]

#223: session.py and build directory path change
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 Reporter:  jelte         |       Owner:  jelte                      
     Type:  defect        |      Status:  new                        
 Priority:  critical      |   Milestone:  05. 3rd Incremental Release
Component:  Unclassified  |    Keywords:                             
Sensitive:  0             |  
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 Since session.py now contains a configure-time variable, the path changed
 from below $srcdir to below $builddir, which presents us with a problem;
 it is not included in the PYTHONPATH the tests use, and adding builddir to
 the PYTHONPATH won't fix it, since we then have two directories specifying
 parts of one module.

 There are several quick hacks to fix this but I think making a move
 towards the third solution suggested in
 https://lists.isc.org/pipermail/bind10-dev/2010-May/000975.html (and the
 followup message) would be the best, even though we're in code freeze
 right now.

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Ticket URL: <https://bind10.isc.org/ticket/223>
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