select/cray: we also need apbasil in stepdmgr

This fixes a bug in adding the configuration file parer. The cray_conf
structure must always be created, since we are also using the plugin in
stepdmgr context.

The observed causes were core dumps and the inability to run batch jobs
(since trying to confirm the ALPS reservation with a NULL cray_conf->apbasil
 resulted in segfaults).