[IMP] let bash resolve openerp-server path

It isn't necessary to specify an absolute path, so let's stay flexible
just in case.

8.0/Dockerfile

@@ -45,4 +45,4 @@ ENV OPENERP_SERVER /etc/odoo/openerp-server.conf
 USER odoo
 
 ENTRYPOINT ["/entrypoint.sh"]
-CMD ["/usr/bin/openerp-server"]
+CMD ["openerp-server"]

8.0/entrypoint.sh

@@ -12,10 +12,10 @@ export PGHOST PGPORT PGUSER PGPASSWORD
 case "$1" in
 	--)
 		shift
-		exec /usr/bin/openerp-server "$@"
+		exec openerp-server "$@"
 		;;
 	-*)
-		exec /usr/bin/openerp-server "$@"
+		exec openerp-server "$@"
 		;;
 	*)
 		exec "$@"