[ND provider] improved latency of ND provider by using INLINE send

[ND provider] improved latency of ND provider by using INLINE send

This patch adds usage of INLINE DATA facility of Mellanox HCAs for improving latency of ND provider.

Here are the ideas of the patch:
    - by default, ND provider will create QP with inline data of 160 bytes;
    (this can enlarge user's QP size)
    - one can change this default by defining environment variable IBNDPROV_MAX_INLINE_SIZE;
    - an ND application, while creating QP, can define the necessary INLINE DATA size; this value takes precedence over the default one.

git-svn-id: svn://openib.tc.cornell.edu/gen1@2333 ad392aa1-c5ef-ae45-8dd8-e69d62a5ef86