Openstack service not working with neutron Stderr: 'sudo: no tty present and no askpass program specified\n'

Issue

• Neutron, nova and cinder are not working. All show similar errors in their respective logs.

2014-04-01 08:46:46.726 6533 TRACE neutron Command: ['sudo',
'neutron-rootwrap', '/etc/neutron/rootwrap.conf', 'ip', 'link', 'add',
'int-br-ex', 'type', 'veth', 'peer', 'name', 'phy-br-ex']
2014-04-01 08:46:46.726 6533 TRACE neutron Exit code: 1
2014-04-01 08:46:46.726 6533 TRACE neutron Stdout: ''
2014-04-01 08:46:46.726 6533 TRACE neutron Stderr: 'sudo: no tty present
and no askpass program specified\n'