xenserver: Update Open vSwitch post upgrade instructions.

Currently, when we upgrade the userspace rpm for XenServer,
we print a message asking users to reboot the hypervisor.
This is not needed. The reboot of hypervisor is needed when
we upgrade the rpm containing the kernel module.  This
reboot can sometimes be avoided by running a
"service openvswitch force-reload-kmod".

Signed-off-by: Gurucharan Shetty <gshetty@nicira.com>

xenserver/openvswitch-xen.spec.in

@@ -291,10 +291,10 @@ done
 # Ensure all required services are set to run
 for s in openvswitch openvswitch-xapi-update; do
     if chkconfig --list $s >/dev/null 2>&1; then
-        chkconfig --del $s || printf "Could not remove $s init script."
+        chkconfig --del $s || printf "Could not remove $s init script.\n"
     fi
-    chkconfig --add $s || printf "Could not add $s init script."
-    chkconfig $s on || printf "Could not enable $s init script."
+    chkconfig --add $s || printf "Could not add $s init script.\n"
+    chkconfig $s on || printf "Could not enable $s init script.\n"
 done
 
 if [ "$1" = "1" ]; then    # $1 = 1 for install
@@ -307,12 +307,8 @@ else    # $1 = 2 for upgrade
         printf "\nThe server is not configured to run Open vSwitch.  To run in\n"
         printf "vswitch mode, you must run the following command:\n\n"
         printf "\txe-switch-network-backend vswitch"
-    else
-        printf "\nTo use the new Open vSwitch install, you should reboot the\n"
-        printf "server now.  Failure to do so may result in incorrect operation."
+        printf "\n\n"
     fi
-
-    printf "\n\n"
 fi
 
 %posttrans %{module_package}
@@ -325,6 +321,15 @@ fi
 # be removed.
 depmod %{xen_version}
 
+mode=$(cat /etc/xensource/network.conf)
+if [ "$mode" = "vswitch" ] || [ "$mode" = "openvswitch" ]; then
+    printf "\nTo use the newly installed Open vSwitch kernel module, you\n"
+    printf "will either have to reboot the hypervisor or follow any\n"
+    printf "workarounds provided by your administration guide. Failure to do\n"
+    printf "so may result in incorrect operation."
+    printf "\n\n"
+fi
+
 %preun
 if [ "$1" = "0" ]; then     # $1 = 0 for uninstall
     # Configure system to use bridge