MFC r339891, r340063, r342266, r342270, r342272, r342288-r342289

r339891:
cxgbe/iw_cxgbe: Install the socket upcall before calling soconnect to
ensure that it always runs when soisconnected does.

Submitted by: Krishnamraju Eraparaju @ Chelsio
Sponsored by: Chelsio Communications

r340063:
cxgbe/iw_cxgbe: Suppress spurious "Unexpected streaming data ..."
messages.

Submitted by: Krishnamraju Eraparaju @ Chelsio
Sponsored by: Chelsio Communications

r342266:
cxgbe/iw_cxgbe: Use DSGLs to write to card's memory when appropriate.

Submitted by: Krishnamraju Eraparaju @ Chelsio
Sponsored by: Chelsio Communications

r342270:
cxgbe/iw_cxgbe: Add a knob for testing that lets iWARP connections cycle
through 4-tuples quickly.

Submitted by: Krishnamraju Eraparaju @ Chelsio
Sponsored by: Chelsio Communications

r342272:
cxgbe/iw_cxgbe: Use -ve errno when interfacing with linuxkpi/OFED.

Submitted by: Krishnamraju Eraparaju @ Chelsio
Sponsored by: Chelsio Communications

r342288:
cxgbe/iw_cxgbe: Do not terminate CTRx messages with \n.

r342289:
cxgbe/iw_cxgbe: Remove redundant CTRs from c4iw_alloc/c4iw_rdev_open.
This information is readily available elsewhere.

Sponsored by: Chelsio Communications