Fixes Cinder volume upload to image on windows

Due to fact that when uploading a volume to an image the file is
opened in text mode and the different line endings style on
windows glance client won't be able to upload the desired file.
The solutions is to simply open the file in binary mode when
performing this action.

Change-Id: I51b084ce38e1aaad4ded63b75b097137dedc088c
Closes-bug: 1346911
Implements new 'bootable' option for manage existing volume.

A 'bootable' option (defaults to False) can be passed as part of
the HTTP POST request to manage an existing volume.  This is
passed into the database when the volume is created.

Also changes all drivers to use the more agnostic keys
'source-name' or 'source-id' when specifying
which existing volume to manage.  This change is to support the
cinderclient change in https://review.openstack.org/#/c/76216/
to make it easier for CLI users to manage existing volumes
without having to know the implementation-specifics of the driver.

Change-Id: I58eaa75181fd0b606628584308fd83bdeaa8b64f
Implements: blueprint add-export-import-volumes
Merge "Fixes Cinder volume upload to image on windows"
Merge "Implements new 'bootable' option for manage existing volume."