Python ntpclients are also getting installed as modules

Since !588 (merged) -- or, if i made a mistake, my not-yet-merged !590 (closed) -- the Python ntpclients have been getting installed correctly (to prefix/bin) and a second time, to prefix/lib/pythonx.y/site-packages or whatever.

Partial sudo ./waf install output:

+ install /usr/local/lib/python2.7/dist-packages/ntp/version.py (from build/main/pylib/version.py)
+ install /usr/local/lib/python2.7/dist-packages/ntp/version.pyc (from build/main/pylib/version.pyc)
+ install /usr/local/lib/python2.7/dist-packages/ntp/version.pyo (from build/main/pylib/version.pyo)
+ install /usr/local/lib/python2.7/dist-packages/ntpclients/ntploggps.py (from ntpclients/ntploggps.py)
+ install /usr/local/lib/python2.7/dist-packages/ntpclients/ntploggps.pyc (from build/main/ntpclients/ntploggps.pyc)
+ install /usr/local/lib/python2.7/dist-packages/ntpclients/ntploggps.pyo (from build/main/ntpclients/ntploggps.pyo)

+ install /usr/local/lib/python2.7/dist-packages/ntpclients/ntpsnmpd.py (from ntpclients/ntpsnmpd.py)
+ install /usr/local/lib/python2.7/dist-packages/ntpclients/ntpsnmpd.pyc (from build/main/ntpclients/ntpsnmpd.pyc)
+ install /usr/local/lib/python2.7/dist-packages/ntpclients/ntpsnmpd.pyo (from build/main/ntpclients/ntpsnmpd.pyo)
+ install /usr/local/bin/ntpleapfetch (from build/main/ntpclients/ntpleapfetch)
+ install /usr/local/bin/ntploggps (from build/main/ntpclients/ntploggps)
+ install /usr/local/bin/ntpdig (from build/main/ntpclients/ntpdig)