credmgr: Fix copy and paste error in add_validator

This won't hurt as long as sets and validators are of the same class.
But as soon as one of the object's class is changed this will cause
either a compile error (best option), or result (most likely) in a
crash.

Signed-off-by: Thomas Egerer <thomas.egerer@secunet.com>
Allow to treat specified Attribute-Type-Not-Supported errors as non-fatal
Implemented IF-M segmentation contracts
Added request variable to get_info_string method
Implemented IF-M segmentation
Added out message queue for imv_msg receive method
Merged libpts into libimcv
Compacted chunk creation in ita_attr_command constructor
Unit tests for libimcv