Remove legacy driver name mappings

We have several drivers that were renamed in Ocata, and one
(Dell EMC SC Series) that was renamed in Pike. Since this
has been over two releases, we can now remove the legacy
name mapping for these drivers.

Change-Id: I0a350c94ed4637c59b82dfad3926714451e37abb

cinder/volume/manager.py

@@ -150,30 +150,6 @@ CONF.register_opts(volume_manager_opts)
 CONF.register_opts(volume_backend_opts, group=config.SHARED_CONF_GROUP)
 
 MAPPING = {
-    'cinder.volume.drivers.emc.scaleio':
-    'cinder.volume.drivers.dell_emc.scaleio.driver',
-    'cinder.volume.drivers.emc.vnx.driver.EMCVNXDriver':
-    'cinder.volume.drivers.dell_emc.vnx.driver.VNXDriver',
-    'cinder.volume.drivers.emc.xtremio.XtremIOISCSIDriver':
-    'cinder.volume.drivers.dell_emc.xtremio.XtremIOISCSIDriver',
-    'cinder.volume.drivers.emc.xtremio.XtremIOFibreChannelDriver':
-    'cinder.volume.drivers.dell_emc.xtremio.XtremIOFCDriver',
-    'cinder.volume.drivers.datera.DateraDriver':
-    'cinder.volume.drivers.datera.datera_iscsi.DateraDriver',
-    'cinder.volume.drivers.emc.emc_vmax_iscsi.EMCVMAXISCSIDriver':
-    'cinder.volume.drivers.dell_emc.vmax.iscsi.VMAXISCSIDriver',
-    'cinder.volume.drivers.emc.emc_vmax_fc.EMCVMAXFCDriver':
-    'cinder.volume.drivers.dell_emc.vmax.fc.VMAXFCDriver',
-    'cinder.volume.drivers.eqlx.DellEQLSanISCSIDriver':
-    'cinder.volume.drivers.dell_emc.ps.PSSeriesISCSIDriver',
-    'cinder.volume.drivers.dell.dell_storagecenter_iscsi.'
-    'DellStorageCenterISCSIDriver':
-    'cinder.volume.drivers.dell_emc.sc.storagecenter_iscsi.'
-    'SCISCSIDriver',
-    'cinder.volume.drivers.dell.dell_storagecenter_fc.'
-    'DellStorageCenterFCDriver':
-    'cinder.volume.drivers.dell_emc.sc.storagecenter_fc.'
-    'SCFCDriver',
     'cinder.volume.drivers.windows.windows.WindowsDriver':
     'cinder.volume.drivers.windows.iscsi.WindowsISCSIDriver',
 }