ASACORE-1183 Cleanup AboutService and AboutClient samples

The samples used things like MsgArg::ToString to pring output that
resulted in hard to read output.  Other minor cleanup.

Change-Id: I7d8b87fed990d699354ffd511437a743fb848265
Signed-off-by: George Nash <georgen@qce.qualcomm.com>
Merge "ASACORE-1183 Cleanup AboutService and AboutClient samples" into RB14.12