Get ports from configuration if there are some.
[ganeti-local] / daemons /
drwxr-xr-x   ..
-rw-r--r-- 48 Makefile.am
-rwxr-xr-x 5048 ganeti-master
-rwxr-xr-x 12211 ganeti-noded
-rwxr-xr-x 9299 ganeti-watcher