doc: updated conf.py and different *.rst files with new references.

Updated conf.py (sys.path, copyright's year), Removed empty
storage/overview file. Updated references in the different
*.rst files by using fully qualified package names.

Doc generation now works except for clientIf and vm modules,
but a little step is necessary: adding to the PYTHONPATH
the vdsm python package.

Change-Id: I78a66de2182e75d413212bceb47453127fdb07f8
Signed-off-by: Giuseppe Vallarelli <giuseppevallarelli@gmail.com>
Signed-off-by: Dan Kenigsberg <danken@redhat.com>
Reviewed-on: http://gerrit.ovirt.org/11628