* src/conf.c: documentation cleanups from Jim Meyering

* src/conf.c: documentation cleanups from Jim Meyering
* tests/conftest.c: Use fwrite, not printf, since the
  result buffer is not NUL-terminatedi, from Jim Meyering.
* tests/qemuxml2argvtest.c: Initialize vm.migrateFrom[0],
  to avoid "read-uninitialized" error from within
  qemudBuildCommandLinei, from Jim Meyering.
Daniel