Add setup.cfg for gtools.

setup.py installs console scripts in /usr/bin/. snf-ganeti-hook,
snf-dispatcher, snf-ganeti-eventd scripts should be in /usr/sbin.
Add setup.cfg in snf-cyclades-gtools to change install-scripts option.
Signed-off-by: Dimitris Aragiorgis <dimara@grnet.gr>

snf-cyclades-gtools/setup.cfg

+[install]
+install-scripts=/usr/sbin