Added BASE_PATH constant to CifAfs and static get_path_for method, used in CifLdap
Decoupled CifKerberos from CifLdap
Moved DOMAIN constant to CifKerberos because it's for our Kerberos domain
Added get_principal_for_user method to CifKerberos
Utilized new CifKerberos methods in CifLdap
Fixed potential issue with CifKebreros::get_principal_for_user
Began refactoring CifAfs