Delete shared memory segment files when vpp starts

Should have been done this way years ago. My bad.

Change-Id: Ic7bf937fb6c4dc5c1b6ae64f2ecf8608b62e7039
Signed-off-by: Dave Barach <dave@barachs.net>

build-root/deb/debian/vpp.service

@@ -4,7 +4,6 @@ After=network.target
 
 [Service]
 Type=simple
-ExecStartPre=-/bin/rm -f /dev/shm/db /dev/shm/global_vm /dev/shm/vpe-api
 ExecStartPre=-/sbin/modprobe uio_pci_generic
 ExecStart=/usr/bin/vpp -c /etc/vpp/startup.conf
 ExecStopPost=/bin/rm -f /dev/shm/db /dev/shm/global_vm /dev/shm/vpe-api

build-root/deb/debian/vpp.upstart

@@ -1,12 +1,11 @@
 description	"vector packet processing engine"
-author          "Cisco Systems, Inc <listname@cisco.com>"
+author          "Cisco Systems, Inc <vpp-dev@lists.fd.io>"
 
 manual
 
 respawn
 
 pre-start script
-   rm -f /dev/shm/db /dev/shm/global_vm /dev/shm/vpe-api || true
    # should be there via dkms, but if not, start anyway
    modprobe uio_pci_generic || true
 end script