MFC r352975:
Unify prints in mlx5core.

All prints in mlx5core should use on of the macros:
mlx5_core_err/dbg/warn

Submitted by: slavash@
Sponsored by: Mellanox Technologies

MFC r341556:
mlx5: Fix for potential memory leaks.

Make sure allocated data gets freed in error cases.

Sponsored by: Mellanox Technologies

MFC r325638 and r325976:
Refactor the flowsteering APIs used by mlx5en(4). This change is needed by
the coming ibcore and mlx5ib updates in order to support traffic redirection
to so-called raw ethernet QPs.

Remove unused E-switch related routines and files while at it.

Sponsored by: Mellanox Technologies