I guess this has to do with the dependency on contrail-web-core package. 

contrail-web-core_3.1.1.0-45_amd64.de should depend on nodejs (>= 0.10.35-1contrail1), 
but it actually depends on nodejs (>= 0.8.15-1contrail1). 

------------------------------------------------------------ 
(after upgrade) 
root@sv-1:~# nodejs -v 
v0.8.15 
root@sv-1:~# dpkg -s contrail-web-core 
Package: contrail-web-core 
Status: install ok installed 
Priority: extra 
Section: contrail-web-core 
Installed-Size: 83765 
Maintainer: swamy <email address hidden> 
Architecture: amd64 
Version: 3.1.1.0-45 
Replaces: contrail-webui 
Depends: redis-server (>= 2:2.6.13-1), nodejs (>= 0.8.15-1contrail1) <<< this 
Conflicts: contrail-webui 
Conffiles: 
/etc/contrail/config.global.js 486b3a720c0c15880d04800b464dff85 
/etc/contrail/contrail-webui-userauth.js 96d429539030e61e9f719675a7ac8017 
Description: Contrail Systems Web UI 
------------------------------------------------------------ 

So, nodejs package is not updated during upgrade. 

upgrade_2.21to3.1.0.log: 
------------------------------------------------------------------------------ 
2016-11-28 09:25:13:051824: [root@10.0.0.201] out: The following extra packages will be installed: 
2016-11-28 09:25:13:067773: [root@10.0.0.201] out: contrail-web-controller contrail-web-core opscenter 
2016-11-28 09:25:13:067938: [root@10.0.0.201] out: The following NEW packages will be installed: 
2016-11-28 09:25:13:071481: [root@10.0.0.201] out: opscenter 
2016-11-28 09:25:13:071584: [root@10.0.0.201] out: The following packages will be upgraded: 
2016-11-28 09:25:13:075102: [root@10.0.0.201] out: contrail-openstack-webui contrail-web-controller contrail-web-core 
2016-11-28 09:25:13:085830: [root@10.0.0.201] out: 3 upgraded, 1 newly installed, 0 to remove and 247 not upgraded. 
------------------------------------------------------------------------------ 

Upgrading nodejs package resolved the issue. 

------------------------------------------------------------------------------ 
root@sv-1:~# apt-get install nodejs 
Reading package lists... Done 
Building dependency tree 
Reading state information... Done 
The following packages were automatically installed and are no longer required: 
jsvc libcommons-daemon-java libjna-java librdkafka1 
Use 'apt-get autoremove' to remove them. 
The following packages will be upgraded: 
nodejs 
1 upgraded, 0 newly installed, 0 to remove and 250 not upgraded. 
Need to get 0 B/3,937 kB of archives. 
After this operation, 4,140 kB of additional disk space will be used. 
WARNING: The following packages cannot be authenticated! 
nodejs 
Authentication warning overridden. 
(Reading database ... 128369 files and directories currently installed.) 
Preparing to unpack .../nodejs_0.10.35-1contrail1_amd64.deb ... 
Unpacking nodejs (0.10.35-1contrail1) over (0.8.15-1contrail1) ... 
Processing triggers for man-db (2.6.7.1-1) ... 
Setting up nodejs (0.10.35-1contrail1) ... 
root@sv-1:~# contrail-status 
== Contrail Control == 
supervisor-control: active 
contrail-control active 
contrail-control-nodemgr active 
contrail-dns active 
contrail-named active 

== Contrail Analytics == 
supervisor-analytics: active 
contrail-alarm-gen:0 active 
contrail-analytics-api active 
contrail-analytics-nodemgr active 
contrail-collector active 
contrail-query-engine active 
contrail-snmp-collector active 
contrail-topology active 

== Contrail Config == 
supervisor-config: active 
contrail-api:0 active 
contrail-config-nodemgr active 
contrail-device-manager backup 
contrail-discovery:0 active 
contrail-schema backup 
contrail-svc-monitor backup 
ifmap active 

== Contrail Web UI == 
supervisor-webui: active 
contrail-webui active 
contrail-webui-middleware active 

== Contrail Database == 
contrail-database: active 

== Contrail Supervisor Database == 
supervisor-database: active 
contrail-database-nodemgr active 
kafka active 

== Contrail Support Services == 
supervisor-support-service: active 
rabbitmq-server active 

root@sv-1:~# service supervisor-webui restart 
supervisor-webui stop/waiting 
supervisor-webui start/running, process 31975 
root@sv-1:~# netstat -natp | egrep "8080|8143" 
tcp 0 0 0.0.0.0:8143 0.0.0.0:* LISTEN 31998/node 
tcp 0 0 0.0.0.0:8080 0.0.0.0:* LISTEN 31998/node 
root@sv-1:~# 
------------------------------------------------------------------------------ 

Even running the following fab tasks instead of apt-get resolves the issue too.

fab uninstall_webui 
fab install_webui 
fab setup_webui

Please fix this.