Introduce initial_machine_version server config. #498
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This new key can be used to specify the initial machine version
a new Ra server should be initialised against.
This allows machines to skip old versions when creating a new
Ra cluster. This is particularly useful when machine_version_strategy=all
as the initial machine upgrade upgrade after cluster creation is delayed until
all members reply to the info requests.
If the machine_version_strategy=all, starting a server with
an initial machine version that is higher than the locally available
machine version will result in an error: {error, invalid_initial_machine_version}.
When machine_version_strategy=quorum the initial machine version
will be clamped to the locally available machine version.
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This new key can be used to specify the initial machine version
a new Ra server should be initialised against.
This allows machines to skip old versions when creating a new
Ra cluster. This is particularly useful when machine_version_strategy=all
as the initial machine upgrade upgrade after cluster creation is delayed until
all members reply to the info requests.
If the machine_version_strategy=all, starting a server with
an initial machine version that is higher than the locally available
machine version will result in an error: {error, invalid_initial_machine_version}.
When machine_version_strategy=quorum the initial machine version
will be clamped to the locally available machine version.
Fixes #497