diag: Change the socket interfaces to use QRTR

IPC Router is being deprecated in favor of QRTR. Refactor the control
socket behavior to be handled by QMI helpers. Change socket family to
QRTR. Add handling for ENETRESET errors from the QRTR nameservice.

Change-Id: Ic4e7dfc7564f01953e26f345f8d37de1b0ec89ac
Signed-off-by: Chris Lew <clew@codeaurora.org>