Brick: fix bug in tgt conf for volume

872b7ca0fc5ce4911fdaadee464d46be5a38058d was intended to explicitly
specify the driver being used by tgt for each target. The issue is that
'lld' is not a valid directive therefore the default is being used. The
default used by tgt is iscsi.

This commit replaces 'lld' with the correct directive of 'driver'.

Change-Id: I6153ee8b24039aedc4ab471f7d00517411791dac
Closes-bug: #1396265
RBD: use image_conversion_dir for image operations

This patch deprecates the rbd-only 'volume_tmp_dir' from the rbd driver
in favor of image_conversion_dir for image operations.

Closes-Bug: #1375490
DocImpact: config option removal
Change-Id: I46ab21c2a90be136d1eb677fcefcc3d65c48a3c5
Imported Translations from Transifex

For more information about this automatic import see:
https://wiki.openstack.org/wiki/Translations/Infrastructure

Change-Id: If00e7075870d6d391bf8722766e9dde1ca861713
Merge "Imported Translations from Transifex"
Merge "Brick: fix bug in tgt conf for volume"
Merge "RBD: use image_conversion_dir for image operations"