[ofw] ndrping issues

[Hefty, Sean]

>I'd think I'd like to see GetConnectionData cap the inbound read limit to what
>the HCA can support, and CreateEndpoint check that the provided
>OutboundReadLimit doesn't exceed what was offered.  I'll fix the test to not be
>busted, though.

GetConnectionData() is only for the active side.  I don't see a way for the server side to see what value was offered in the REQ.  So, someplace in the code needs to cap the limits.

Winverbs pushed the checks to the user and expected the HCA driver to enforce the values in the kernel.