dom0: create lockfile for libxl and set dom0 name in xenstore
dom0: create lockfile for libxl and set dom0 name in xenstore

Create lockfile to set it proper permissions. Without it the first use
(qvm-start netvm) will create it with root:root and 600.
Without xend, no one sets dom0 name...

woju/qubes-core-admin,marmarek/qubes-core-admin,woju/qubes-core-admin,marmarek/qubes-core-admin,woju/qubes-core-admin,QubesOS/qubes-core-admin,QubesOS/qubes-core-admin,marmarek/qubes-core-admin,QubesOS/qubes-core-admin,woju/qubes-core-admin