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In case if a CLI configuration is not available, dhclient cannot add
nameservers to a `resolv.conf` file, because `vyos-hostsd` requires that
an interface be listed in the `set system name-server` option.
This commit introduces two changes:
* `vyos-hostsd` service will not be started before Cloud-Init fetch all
remote data. This is required because all meta-data should be available
for Cloud-Init before any of VyOS-related services start since it is
used for configuration generation.
* the `vyos-hostsd-client` in the `dhclient-script` will be used only if
the `vyos-hostsd` is running. In other words - if VyOS services already
started, dhclient changes `resolv.conf` using `vyos-hostsd`; in other
cases - does this directly.
These changes should protect us from problems with DHCP during system
boot if DHCP is required by third-party utils.
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To better control access from other daemons that may not be running as root,
create a new group 'hostsd' to which the other daemons running users can be
added.
Run vyos-hostsd as root:hostsd to create the socket file with correct user and
group.
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- set RuntimeDirectory to vyos-hostsd
- set RuntimeDirectoryPreserve in order to not delete the state file between
service restarts (/run will be deleted across reboots as it's on a tmpfs but
the state doesn't need to be saved across reboots anyway)
- set WorkingDirectory to /run/vyos-hostsd
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