add SFM template

geant/gap_ansible/roles/base_config/templates/routers/nokia/sfm.j2

+  {% for sfm in nokia_sfms %}
+  <sfm xmlns="urn:nokia.com:sros:ns:yang:sr:conf" xmlns:nc="urn:ietf:params:xml:ns:netconf:base:1.0" xmlns:nokia-attr="urn:nokia.com:sros:ns:yang:sr:attributes" alu:operation="replace">
+      <sfm-slot>{{ sfm.sfm_id }}</sfm-slot>
+      <admin-state>enable</admin-state>
+      <sfm-type>{{sfm.sfm_type }}</sfm-type>
+  </sfm>
+  {% endfor %}