Fix IntOpt type of VMAX config options
Fix IntOpt type of VMAX config options

To integer config options for the VMAX driver were being defined
as StrOpts. This apparently did not cause issues with the driver,
but it would result in error messages during config file generation.

Change-Id: I8dcfef5f806e0f57ad9e981069607fa2de49db70

eharney/cinder,openstack/cinder,phenoxim/cinder,Datera/cinder,eharney/cinder,mahak/cinder,j-griffith/cinder,Datera/cinder,openstack/cinder,phenoxim/cinder,j-griffith/cinder,mahak/cinder