please review: Ticket 47937 - Crash when using invalid attribute for dnaType in DNA plugin config

[Mark Reynolds]

https://fedorahosted.org/389/ticket/47937

https://fedorahosted.org/389/attachment/ticket/47937/0001-Ticket-47937-Cr...

lib389 test:
https://fedorahosted.org/389/attachment/ticket/47937/0002-lib389-testcase...