python-twisted: fix packaging QA warnings

* package topfiles and egg-info in PN-core
* fix find call (without braces it removes only last match -name ".h") and
  _epoll.c, _initgroups.c are left in image
* fixes
python-twisted-10.2.0: python-twisted: Files/directories were installed but not shipped
  /usr/lib/python2.7/site-packages/Twisted-10.2.0-py2.7.egg-info
  /usr/lib/python2.7/site-packages/Twisted-10.2.0-py2.7.egg-info/top_level.txt
  /usr/lib/python2.7/site-packages/Twisted-10.2.0-py2.7.egg-info/dependency_links.txt
  /usr/lib/python2.7/site-packages/Twisted-10.2.0-py2.7.egg-info/requires.txt
  /usr/lib/python2.7/site-packages/Twisted-10.2.0-py2.7.egg-info/SOURCES.txt
  /usr/lib/python2.7/site-packages/Twisted-10.2.0-py2.7.egg-info/PKG-INFO
  /usr/lib/python2.7/site-packages/Twisted-10.2.0-py2.7.egg-info/not-zip-safe
  /usr/lib/python2.7/site-packages/twisted/topfiles
  /usr/lib/python2.7/site-packages/twisted/python/_epoll.c
  /usr/lib/python2.7/site-packages/twisted/python/_initgroups.c
  /usr/lib/python2.7/site-packages/twisted/topfiles/NEWS
  /usr/lib/python2.7/site-packages/twisted/topfiles/README
  /usr/lib/python2.7/site-packages/twisted/topfiles/ChangeLog.Old
  /usr/lib/python2.7/site-packages/twisted/topfiles/CREDITS

Signed-off-by: Martin Jansa <Martin.Jansa@gmail.com>