Remove hard-coded remote user from iptrunk and iptrunk_checks

geant/gap_ansible/playbooks/iptrunks.yaml

 - name: Manage iptrunks playbook
   hosts: all
   # remote_user: "{{ gap_ansible_user }}"
-  remote_user: geant-ne-na-lab
+  # remote_user: geant-ne-na-lab
   gather_facts: false
   roles:
     - Juniper.junos

geant/gap_ansible/playbooks/iptrunks_checks.yaml

 - name: Manage iptrunks checks playbook
   hosts: all
   # remote_user: "{{ gap_ansible_user }}"
-  remote_user: geant-ne-na-lab
+  # remote_user: geant-ne-na-lab
   gather_facts: false
   roles:
     - Juniper.junos