(slapi_x_XXX is still reserved for exported functions that are not part
of the SLAPI specification)

negative error codes.

Plugins should never return positive error codes except in the case
of bind pre-operation plugins, where they should return SLAPI_BIND_XXX.

This should fix ITS #2616 ...

This API allows a plugin to associate arbitrary context with an
internal server object such as a connection or operation.

Some documentation is at:

http://enterprise.netscape.com/docs/directory/602/plugin/function.htm#1104211