remove auth key from P-ONLY groups

geant/gap_ansible/roles/base_config/templates/routers/nokia/router/bgp.j2

@@ -7,7 +7,6 @@
                 </local-as>
                 <group alu:operation="replace">
                     <group-name>iGEANT-P-ONLY</group-name>
-                    <authentication-key>aX1kndQNDTAHyJttsnoyKVBRm1bxaCpuK+c= hash2</authentication-key>
                     <admin-state>enable</admin-state>
                     <next-hop-self>true</next-hop-self>
                     <type>internal</type>
@@ -20,7 +19,6 @@
                 </group>
                 <group alu:operation="replace">
                     <group-name>iGEANT6-P-ONLY</group-name>
-                    <authentication-key>aX1kndQNDTAHyJttsnoyKQiLcy8euS8do68= hash2</authentication-key>
                     <next-hop-self>true</next-hop-self>
                     <type>internal</type>
                     <peer-as>{{ geant_re_as_number }}</peer-as>