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Refs: #3862

Refs: #3862

Methods exposed:

get_user_info as authenticate
get_uuid[s] as uuid
get_username[s] as username
get_quotas as quotas
services_get_uuid[s]/username[s]/quotas as service uuid/username/quotas

Refs: #3633

- Meta-->metadata in some cases, according to the expected cyclades API
- remove values level from requests and responses @ cyclades lib

Refs: #3633

- validate image metadata format
- read metadata from file
- merge file-loaded metadata with runtimes
- store metadata file on pithos, check existance, overwrite with -f
- raise helpful error messages when there fail

Refs: #3797

- Ensure uniform image meta output
- Easy to apply the correct meta format

Refs: #3797

Conflicts:
	Changelog
	kamaki/cli/commands/image.py

Also, take care of pep8 issues

Refs: #3732

Refs: #3732

Refs: #3732

Refs: #3732

Refs: #3780

Parse ivalid property file and guide users to correct it
Guide users to pass valid container:path parameters

Refs:#3769

Refs: #3608

Refs: #3608

Refs: #3769

Log of changes:
- Properties are stored in a remote file on Pithos+
- File name is <image-file>.meta
- Feature can be switched off with --no-property-file-upload
- If remote property file exists, registration is aborted
- If remote property file exists, force with -f, --fforce-upload-property-file
- Location is given as container:path
- User id can be aquired internaly with an astakos call

Refs: #3769, #3778

Refs: #3769

Refs: #3756

- Add image.add_member missing content-length header
- Rename image-[add|del]member commands to members-[add|delete]
- Remove update option from image-register
- In image-compute split properties to properties-list and properties-get
- Add optional output to methods
 * image: unregister, members add/delete/set
 * image compute: delete, properties delete
- Transliterate methods to list-get-set-delete command groups:
 * image: members, member
 * image compute: properties

Refs :#3756 #3732