Fix typo in neutron's default/main.yml file

There is an unnecessary condition operator in neutron's
defaults/main.yml which causes pull error.

- Delete an duplicated "or" from neutron-sfc-agent host_in_groups
 check condition.

Change-Id: I32626ad83fbca9a17cd89b70ff95d58d23b200d2
Closes-Bug: #1665188