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Refs: #3608

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

Apply the feature wherever is applicable
Generalize the feature by moving the corresponding code to _command_init

Refs: #3756 #3732

 - Add optional output for file methods: mkdir, touch, create, move, create,
    copy, move, append, delete, purge, info, meta, upload
 - Transliterate permissions and metadata methods to apear as get/set/delete
    command subgroups
    e.g. kamaki file metadata set ...
    instead of
    kamaki file setmeta
- Add method create_container to pithos client, add unit and functional tests

Also, kamaki.clients.pithos.copy/move_object returns response headers

Refs: #3756 #3732

Refs: #3756 #3732

In kamaki.clients
-------------------
- storage.create_directory returns response headers
- implement pithos.create_container

In kamaki.cli.pithos
-------------------
- add flag --with_output for optional output
- add (-j, --json) flag for optional json-formated output
- apply these changes to file_mkdir, file_touch, file_create

Refs: #3608

Implemented with threads

Refs: #3608

Refs: #3608

The download_to_string method downloads a remote object from pithos into a
string, which is then returned.

Also, implemented unit and functional tests. Changelog is updated

Refs: #3608

Refs: #3707

Each upload involves a request that retrieves block size and hash information.
In higher level applications, this request is redudant after the first upload.
This feature allows higher level operations to cache retrieved container info
in a session.

Refs: #3707

Methods affected:
    upload_object
    upload_object_unchunked
    upload_object_by_manifestation

unittests modified accordingly

Refs: #3656

Refs: bug #3708

In some cases, the term 'GRNET development team' was replaced with 'Synnefo' or
'Synnefo development team'

kamaki file quota --> only for account
kamaki file quota <container> --> kamaki file containerlimit get [container]

Support #3541

Also, do not allow user to set account quota

The if-none-match header option with '*' is used in that case.
This is exposed as 'if_not_exist' in PithosClient.upload_object

Feature #3574

Bug #3509

If a file has multiple same blocks, download one of them and copy it to local
file locations

Merge everything to kamaki.clients

Remove multiple hierarchies of connection classes (== abandon support for
    alternative connection methods, e.g. for requests from pypi)

New connection classes are
- RequestManager
- ResponseManager
Semantics:
    RequestManager constructor commits a request without performing it
      but it performs all sanity checks for url, path, method and params
    RequestManager.perform will perform the commited request, if called
    ResponseManager constructor needs a RequestManager instance
    ResponseManager.(various properties)
        request is pooled from a ContextManagerPool (objpool) when needed.
        Results are cached and used as long as the ResponseManager instance
        is alive

Remove KamakiConnection/ResponseErrors, use ClientError wrapers for everything

Remove the connection livetest

TODO: Adjust unittests

The trick is to check if methods
get_container_info, container_post, object_put
are called with the correct parameters