Command changes from 1.25 to 2.0

1.25 command	2.0 command
juju environment destroy	juju destroy-model
juju environment get	juju model-config
juju environment get-constraints	juju get-model-constraints
juju environment retry-provisioning	juju retry-provisioning
juju environment set	juju model-config
juju environment set-constraints	juju set-model-constraints
juju environment share	juju grant
juju environment unset	juju model-config
juju environment unshare	juju revoke
juju environment users	juju users
juju user add	juju add-user
juju user change-password	juju change-user-password
juju user disable	juju disable-user
juju user enable	juju enable-user
juju user info	juju show-user
juju user list	juju users
juju machine add	juju add-machine
juju machine remove	juju remove-machine
juju authorised-keys add	juju add-ssh-key
juju authorised-keys list	juju ssh-keys
juju authorised-keys delete	juju remove-ssh-key
juju authorised-keys import	juju import-ssh-key
juju get	juju config
juju set	juju config
juju get-constraints	juju get-model-constraints
juju set-constraints	juju set-model-constraints
juju get-constraints	juju get-constraints
juju set-constraints	juju set-constraints
juju backups create	juju create-backup
juju backups restore	juju restore-backup
juju action do	juju run-action
juju action defined	juju actions
juju action fetch	juju show-action-output
juju action status	juju show-action-status
juju storage list	juju storage
juju storage show	juju show-storage
juju storage add	juju add-storage
juju space create	juju add-space
juju space list	juju spaces
juju subnet add	juju add-subnet
juju ensure-availability	juju enable-ha
juju system create-environment	juju add-model
juju system destroy	juju destroy-controller
juju system environments	juju models
juju system kill	juju kill-controller
juju system list	juju controllers
juju system login	juju login
juju system remove-blocks	juju enable-commands
juju system list-blocks	juju disabled-commands