[IOT-2560] ProvClient return -1 on timeout

[IOT-2560] ProvClient return -1 on timeout

This change updates ProvisioningClient's waitCallbackRet to return -1 if it
times out waiting for a callback to indicate the operation has finished.

Change-Id: I904e41fa7fc5fbed73344b08c30c45235678b646
Signed-off-by: Alex Kelley <alexke@microsoft.com>
Reviewed-on: https://gerrit.iotivity.org/gerrit/21741
Tested-by: jenkins-iotivity <jenkins@iotivity.org>
Reviewed-by: Dan Mihai <Daniel.Mihai@microsoft.com>
Reviewed-by: Nathan Heldt-Sheller <nathan.heldt-sheller@intel.com>