output generated header files for lib/dns into source tree, not build tree
moved cfgmgr.py to lib/config/python/isc/config
run_bind10.sh now takes python path from build dir, not src


git-svn-id: svn://bind10.isc.org/svn/bind10/branches/parkinglot@698 e5f2f494-b856-4b98-b285-d166d9295462