KVM: change a few IOError with EnvironmentError
[ganeti-local] / daemons /
drwxr-xr-x   ..
-rwxr-xr-x 14198 ganeti-masterd
-rwxr-xr-x 21567 ganeti-noded
-rwxr-xr-x 6179 ganeti-rapi
-rwxr-xr-x 12798 ganeti-watcher