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Refs: Bug #4276

New format:

/image register Name container:path/to/image

Old format:

/image register Name pithos://user-uuid/container/path/to/image

Now, the old format is also recognized. It is planed to be depricated in a
future version, though

Also, uniformize guides and doc responses for image register

Refs: #4276

Refs: #4276

Refs: #4242

Refs: #4232

Conflicts:
	kamaki/cli/commands/snf-astakos.py

Conflicts:
	kamaki/cli/commands/snf-astakos.py

Refs: #4231

Refs: #4231

Refs: #4231

New methods:
/image meta list/set/delete --<meta>[=value] ... -p k1[=v1] [-p k2[=v2]] ...

Refs: #4231

This method will allow for image update and especialy property handling