add dependency between admin console plugin and file sync plugin

the dependency exists since admin console plugin uses
KalturaFileSyncListResponse
rearrange the python client folder structure

preparation for packaging as PyPI
package python client as PyPI
updated the python library readme
Merge branch 'IX-9.0.0' of https://github.com/kaltura/server into IX-9.0.0-package-python-client
python client readme update

added a note about breaking changes in this version
Merge pull request #35 from kaltura/IX-9.0.0-package-python-client

Ix 9.0.0 package python client