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Use inventory_hostname instead of ansible_nodename

The ips.txt.j2 uses ansible_nodename as a variable (e.g. paravance-5-kavlan-4 - see [1]), while the roles variable contains the node name plus the domain name (e.g. paravance-5-kavlan-4.rennes.grid5000.fr). This leads to a mismatch during the emulation of the network (s.alias doesn't exists - see [2]).

A fix consists in using inventory_hostname instead of ansible_nodename.

[1] https://gitlab.inria.fr/discovery/enoslib/blob/master/enoslib/ansible/roles/utils/templates/ips.txt.j2#L3

[2] https://gitlab.inria.fr/discovery/enoslib/blob/master/enoslib/api.py#L1006-1010

Edited by Ronan-Alexandre Cherrueau
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