examples: Replace sys.exit() with exit()

No need to import sys.

Signed-off-by: Philipp Hahn <hahn@univention.de>

examples/domsave.py

@@ -5,7 +5,6 @@ DIR must exist and be writable by this process.
 """
 
 import libvirt
-import sys
 import os
 from argparse import ArgumentParser
 
@@ -18,7 +17,7 @@ try:
     conn = libvirt.open(None)
 except libvirt.libvirtError:
     print('Failed to open connection to the hypervisor')
-    sys.exit(1)
+    exit(1)
 
 doms = conn.listDomainsID()
 for id in doms: