MFH: r369860

Security update to 4.2.8

The SMIME integration has led to www/rt42 being vulnerable to
shellshock related exploits.

Also contains minor fixes to Oracle DB schema updates from 4.2.7.  No
changes for other RDBMS backends.

While here:

  - Drop @dirrmtry from pkg-plist (mostly) and use @dir() to set the
    permissions on ${LOCALBASE}/etc/rt42/

Approved by:	portmgr (erwin)
Release Notes:	http://bestpractical.com/release-notes/rt/4.2.8
Security:	81e2b308-4a6c-11e4-b711-6805ca0b3d42