update lxd client version to 0.27
update lxd client version to 0.27

There is a breakage with version 0.27 such that older versions of the go
client don't behave correctly when setting configuration. Let's use 0.27.

Signed-off-by: Tycho Andersen <10c18fcb898ee6b17d6575d444b125d10b3f4d6a@canonical.com>

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