playbook: fix vifib-startup playbook

vifib-startup playbook (which contains only vifib-server role) should
run without any dependency on Internet since it runs at boot time on all
vifib servers and must not fail.

playbook/roles/vifib-server/meta/main.yml

----
-dependencies:
-  - { role: package, package_name: util-linux, package_state: present  }