Create custom LDAP schema for portal groups

[hakasapl]

We will need to define some new schema for LDAP to use. Each group should be a posixGroup with an additional class named unityGroup

unityGroup will have the following additional attributes:

groupType = The slug defined in the MySQL groupTypes table
startTime = Start time of the group
endTime - End time of the group

With only the above 2 section, we have a system where groups can be manually created and permissions be assigned (but no one can actually use permissions)