Gandi-cli

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* Add support for paas size s+ for creation/update
* Fixes 232: Update 'gandi record update' command to allow filtering by name
* Fix bug when attempting to migrate a vm which cannot be migrated
* Only display DC closed warning if a date is set

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* FR-SD5 is now the default datacenter.
* Add new 'gandi dns update' command.
* Fixes 228: Generate a user password at the creation of a VM
* Improve wait for ssh connectivity after 'gandi vm create' command to handle ipv6
* Fix a bug with 'gandi disk migrate' command not working with multiple datacenters choices
* Improve documentation for generating username/apikey with Gandi V5

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* New 'dns' namespace to manage DNS records/dnssec through LiveDNS API.
* Add new 'gandi vm migrate' command.
* Refactor internal click code usage. Remove hackish code to handle
nested commands which was limited to only 1 nested level.
- This change will break code of users which were using custom commands
on top of Gandi CLI, To fix this you have to use the proper click syntax
to declare a new group for your commands.
- This change also remove the automatic listing of all namespace commands
upon a typo or unknown/wrong command.
* Fixes 224: DeprecationWarning makes tests fail with python 3.6.2

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* Fixes 223: 'gandi setup' command error
* Fixes 222: AttributeError during vm creation on a private vlan
* Fixes tests for 'gandi deploy' and 'gandi status' commands

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* Add new 'gandi disk migrate' command
* Update 'gandi setup' command to ask for apikey for REST API
* Handle deprecated images
- Add a warning during 'gandi vm create' command
- Display a * before image labels on 'gandi vm create' help
- Display a /!\ DEPRECATED on 'gandi vm images' command
* Fixes 220: gandi record update issues
- Do not cast to int the id of the record, use the retrieve value
- Handle both record syntax with 'IN' or not when parsing
- Delete created zone if record.update call fail from xmlrpc API
* Fixes 219: Can't remove disk snapshot profile
* vm: delete: Fix delete when we reach the list limit
- Fixed a bug when deleting a vm that wasn't listed in the first 500 results
of gandi.iaas.list.
* Fix issue when updating disk kernel with a kernel from another datacenter
- CLI was proposing only kernels available on datacenter 1, but some kernels
are available only on other datacenters, so we list everything for --kernel
parameters, and for disk update command we add a new check if this kernel is
available for this disk on this datacenter.
* Add epilog to help messages to notify user about man documentation
* Add one new verbose level for dumping data

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* Add support for python3.6
* Debian 8 is the new default VM image
* FR-SD3 is the new default datacenter
* Update 'gandi mail create' command to allow passing password as parameter
* Update 'gandi certificate create' command: duration is now limited to 2 years
* Update 'gandi ip create' command to fix bad units in help message
* Fixes 182: 'gandi disk create' will detect datacenter when creating a new VM disk
* Fixes 184: 'gandi disk list' can now filter for attach/detach state
* Fixes 192: 'gandi certificate info' now still works after 500 certificates
* Fixes 201: 'gandi certificate export' was duplicating intermediate certificate
* Fixes 211: 'gandi paas deploy' tests should work again when using git commands
* Fixes a bug with options not using corrected value when deprecated
* Update unixpipe module to remove usage of posix and non portable imports