Fix default permission of distributed tmp/auth directory.

The build scripts produce distribution artifacts with wrong permission for auth dir:

    drwxr-xr-x 0/0               0 2013-04-06 21:54 jboss-as-8.0.0.Alpha1-SNAPSHOT/standalone/tmp/auth/
    drwx------ 0/0               0 2013-04-06 21:54 jboss-as-8.0.0.Alpha1-SNAPSHOT/domain/tmp/auth/

Unfortunatelly also present in 7.2.0 and most likely EAP 6.1

    drwxr-xr-x 0/0               0 2013-04-06 20:08 jboss-as-7.2.0.Final/standalone/tmp/auth/
    drwx------ 0/0               0 2013-04-06 20:08 jboss-as-7.2.0.Final/domain/tmp/auth/