Merge branch 'virt_network' into 'master'

Virtualization virt_network attribute

See merge request !156

docs.it4i/anselm/software/virtualization.md

@@ -324,6 +324,12 @@ Both user and vde network back-end have low performance. For fast interconnect (
 
 Cluster Anselm provides TAP device tap0 for your job. TAP interconnect does not provide any services (like NAT, DHCP, DNS, SMB, etc.) just raw networking, so you should provide your services if you need them.
 
+To enable TAP interconect feature you need to specify virt_network=True PBS resource at job submit.
+
+```console
+$ qsub ... -l virt_network=True
+```
+
 Run qemu with TAP network back-end:
 
 ```console