Issue Description

We should not underestimate what information could be exploited when we return error text to clients. We could accidentally reveal information that should not be public. In those cases we should just say to "check the errors log for more information" instead to revealing the underlying workings of the server and its configuration to a potentially anonymous/malicious client.

So we need to check what text we set for calls like this:

 slapi_pblock_set(pb, SLAPI_PB_RESULT_TEXT, errorbuf);