scm: CONN_PENDING: SOCKOPT ERR Connection refused ->

scm: CONN_PENDING: SOCKOPT ERR Connection refused ->

Error caused by cm_msg size compatability issue with new v8
protocol and older socket cm providers (2.1.4 and older).
The ucm, cma, and mcm providers are not affected.

Modify socket data sizes for SCM request/reply to interoperate
between new v8 with smaller private data and older protocols.

Adjust SCM reply/rtu based on remote CM version and retry a failed
request with pre-v8 adjusted size in case of server side failure.

Signed-off-by: Arlin Davis <arlin.r.davis@intel.com>