~axwalk/juju-core/lp1303195-manual-ubuntuuser-bash

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[r=wallyworld] Add constraints validation to providers

Each provider has a constraints validator which
is used when setting constraints on a machine or
service, as well as when constraints are merged.
The validation step allows conflicting constraints
like instance-type and mem to be rejected, and also
unsupported constraints to be logged with a warning.
The merge step allows things like instance-type to
mask other incompatible constraints like mem or arch,
and visa versa.

https://codereview.appspot.com/88780043/

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