LDAP_GROUPS_FROM_ATTRIBUTES should utilize extra attributes to construct display name

The LDAP_GROUP_LIST is able to specify extra attributes, and these attributes can be used in an EL expression to construct a group display name when a new group is created. The LDAP_GROUPS_FROM_ATTRIBUTES loader, however, only has the EL variable "groupAttribute" that it pulls from the Attribute Name defined for the job, This means that the display name has no option except to be the same as the group name, other than trivial transformations like capitalization. It would be nice to be able to pull in extra attributes the way that the Group List loader can do.

So, the group name could be

${"base:dept:" + groupAttribute + ":staff"}

while the display name would be

${"base:dept:" + groupAttributes['ou'] + " (" + groupAttribute + "):Staff"}