Remove Kolab authentication driver

[ralflang]

All recent major versions of Kolab use incompatible technology and the Kolab authentication driver should be removed.

Components to Remove

Driver

• lib/Horde/Auth/Kolab.php - Kolab authentication driver (95 lines)
  • Derives from Horde_Auth_Base
  • Uses Horde_Kolab_Session for authentication
  • Connects to Kolab IMAP server via session handler

Tests

• test/integration-kolab/KolabTest.php
• test/integration-kolab/ directory

Configuration Reference

This driver is selected via horde/base/config/conf.xml line 350:

<case name="kolab" desc="Kolab authentication">
 <configsection name="params">
 </configsection>
</case>

Dependencies

The Kolab auth driver depends on:

• Horde_Kolab_Session (from Kolab_Session library)
• Horde_Kolab_Session_Exception_Badlogin
• Configuration from $GLOBALS['conf']['kolab'] (base Kolab tab)

Rationale

Similar to horde/Group#2, modern Kolab versions employ technology incompatible with the existing backend implementations. Kolab themselves advise integrating with Kolab using modern standards.