Werk #392: LDAP: Improved error messages of LDAP configuration test

Component	Setup
Title	LDAP: Improved error messages of LDAP configuration test
Date	Dec 19, 2013
Level	Trivial Change
Class	Bug Fix
Compatibility	Compatible - no manual interaction needed
Checkmk versions & editions	1.2.5i1 Checkmk Raw (CRE), Checkmk Enterprise (CEE), Checkmk MSP (CME)

Replaced several internal exception / cryptic errors with (hopefully) better understandable error messages in LDAP configuration test dialog.

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