Add support for volumes backed by Dell EqualLogic

This change set adds support for using Dell EqualLogic arrays
as a backend for Cinder.

Change-Id: I137d2f71a9fc69c0082fdad5cd5100eb232dfdd7
Use lioadm as iscsi helper on RHEL 7

On RHEL 7 it is necessary to use lioadm as iscsi_helper. This patch handles
proper configuration and appropriate package installation.

Change-Id: Ic3a41015c95f0b5f394d0c4b58dfc0eb10d5037d
fix: use $database_connection_real

deprecation of $sql_connection introduced
$database_connection_real which should be
used instead of using $database_connection
directly.

Change-Id: Ic630d346c0bca8f8fb07cf1263d5e345423316e3
Merge "Use lioadm as iscsi helper on RHEL 7"
Merge "Add support for volumes backed by Dell EqualLogic"