[crmsh-4.6] Fix: bootstrap: ssh key of the init node is duplicated in the authorized_keys files of other node (bsc#1218940) #1311
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When a cluster is bootstrap with 'crm cluster init -N', the public key of the init node is added for mutiple times to the authorized_key files of other nodes.
Fix by reusing
AuthorizedKeyManager.add
in swap_public_ssh_key.