Fixes Bug1130377  devstack ldap set values in keystone.conf

Addressed reviewers comments and added some extra properties
needed by latest version of keystone.
This fix sets some needed values in keystone.conf to ensure
that keystone can add entries to LDAP and remain schema
compliant.  It creates a new special role (_member_) that
is needed by the latest version of keystone and also
fixes tenant_id to be tenantId.

Change-Id: Ia2a1ebb7cbedb0af106c74aa9181843cc9739f5d