daemon: remove Quagga 'vtysh' service

Since all Quagga daemons are configured from a consolidated
location (the 'zebra' service), there is nothing left to do
for a dedicated service such as 'vtysh'. This patch removes
the service, along with all references to it from the rest
of the source tree (sample *.imn files, examples, etc.)

Signed-off-by: Gabriel Somlo <glsomlo@cert.org>

daemon/core/xen/xen.py

@@ -109,7 +109,6 @@ class XenNode(PyCoreNode):
         #'sh quaggaboot.sh zebra',
         #'sh quaggaboot.sh ospfd',
         #'sh quaggaboot.sh ospf6d',
-        'sh quaggaboot.sh vtysh',
         'killall zebra',
         'killall ospfd',
         'killall ospf6d',