It is not real an Ericsson specific thing - but Solaris default, The default admin file = /var/sadm/install/admin/default also lists keystore=/var/sadm/security  as the keystore directory - however, the default admin file causes interactive installation.

ref:
http://docs.oracle.com/cd/E19082-01/819-2379/swmgrpkgs-19113/index.html