Fix Travis issues about timeout and the socket problem in the Sync module #940
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This PR fixes two issues:
As we have more and more UT/ITs, 20 minutes are not enough for tests on WinOS +Travis. So, I set the timeout time back to 40 minutes.
I notice some travis failures are caused because:
a. An IT starts an IoTDB instance;
b. the sync module is put into a startup thread;
c. calling setting the timeout of the socket of the module. However, the startup thread for the sync module does not turn to run...
This PR will block the startup process until the socket is opened.