sys: Remove $FreeBSD$: one-line .c pattern

Remove /^[\s*]*__FBSDID\("\$FreeBSD\$"\);?\s*\n/

ibcore: Remove set, but not used variable.

MFC after: 1 week
Sponsored by: NVIDIA Networking

ibcore: Add rdma_reject_msg() helper function.

rdma_reject_msg() returns a pointer to a string message associated with
the transport reject reason codes.

Linux commit:
77a5db13153906a7e00740b10b2730e53385c5a8

MFC after: 1 week
Reviewed by: kib
Sponsored by: Mellanox Technologies // NVIDIA Networking

Infiniband clients must be attached and detached in a specific order in ibcore.

Currently the linking order of the infiniband, IB, modules decide in which
order the clients are attached and detached. For example one IB client may
use resources from another IB client. This can lead to a potential deadlock
at shutdown. For example if the ipoib is unregistered after the ib_multicast
client is detached, then if ipoib is using multicast addresses a deadlock may
happen, because ib_multicast will wait for all its resources to be freed before
returning from the remove method.

Fix this by using module_xxx_order() instead of module_xxx().

Differential Revision: https://reviews.freebsd.org/D23973
MFC after: 1 week
Sponsored by: Mellanox Technologies

ibcore: Discard unused error codes.

Submitted by: hselasky@
Approved by: hselasky (mentor)
MFC after: 1 week
Sponsored by: Mellanox Technologies

Use __FBSDID() for RCS tags in ibcore.

MFC after: 1 week
Sponsored by: Mellanox Technologies

Add missing FreeBSD tags and SVN properties to ibcore.

MFC after: 1 week
Sponsored by: Mellanox Technologies

ibcore: Delete old files and add new ones missed in the initial commit
for this projects branch.

Sponsored by: Mellanox Technologies