SRADA-782 Tracing time value now is got directly from TracingProcessManager.

SRADA-782 Tracing time value now is got directly from TracingProcessManager.

Now tracing time is got without unzip of zipped trace.
In TracingProcess unneeded comment deleted.

In TracingProcessManager and TracingProcess implemented communication threads.
To that moment there are 4 types of messages
 * STOP_TRACING message - is sent from TracingProcessManager to TracingProcess
   to stop it.
 * STOP_DONE message - TracingProcess sends this message to inform that it is
   stopped successfully.
 * REQUEST_TRACING_TIME message - TracingProcessManager requests for tracing
   time value.
 * INFO_TRACING_TIME message - message that contains tracing time value.
List of message types may be extended further.

Change-Id: I43c0f49414d13c141dbc8714ca5eb1a174e7ec34