v1.6.4

Hot fix release for PVE 6.x.

Changes/Fixes
91fc05f Patches the pvecm CLI library to fix cluster join failures (i.e. retain backwards compatibility). This change will be reverted once upstream has pushed an update with this patch. See #91 for more information.
#90 pvelocalhost is no longer inserted into system host files.
#89 pve_manage_ssh can now be used to toggle SSH configuration management. You can use this if you use a role to manage the entire SSH config file - but please note that cluster configuration may become a bit more difficult (as this role inserts config blocks based on your inventory).