Allow the user to supply a vlan client name on the command line.

This is probably only useful for management tools so that they can
use their own names rather than parsing the output of 'info network'.
Signed-off-by: NMark McLoughlin <markmc@redhat.com>
Signed-off-by: NAnthony Liguori <aliguori@us.ibm.com>



git-svn-id: svn://svn.savannah.nongnu.org/qemu/trunk@6220 c046a42c-6fe2-441c-8c8c-71466251a162