Rephrase error message when agent versions != client version. #7911
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Description of change
When bootstrapping controllers with agent version that is different from client version, we'd get a fairly obscure message:
$ juju bootstrap aws mycontroller --agent-version=2.2.3
ERROR requested agent version major.minor mismatch
To avoid surprises and headaches, this PR proposes to re-phrase this message in a user-friendly way:
$ juju bootstrap aws mycontroller --agent-version=2.2.3
ERROR this client can only bootstrap 2.3 agents
QA steps
As per description above.
Documentation changes
n/a
Bug reference
n/a