Tst_QOpcUaClient::getChildren is flaky

********* Start testing of Tst_QOpcUaClient *********
Config: Using QtTest library 5.12.0, Qt 5.12.0 (x86_64-little_endian-lp64 shared (dynamic) release build; by GCC 5.4.0 20160609)
QDEBUG : Tst_QOpcUaClient::initTestCase() [ 0.000 D] default unknown - Using SDK plugin: "open62541"
QDEBUG : Tst_QOpcUaClient::initTestCase() [ 0.006 D] default unknown - Using SDK plugin: "freeopcua"
QDEBUG : Tst_QOpcUaClient::initTestCase() [ 2.007 D] default unknown - Using endpoint: "opc.tcp://localhost:43344"
PASS : Tst_QOpcUaClient::initTestCase()
PASS : Tst_QOpcUaClient::getChildren(open62541)
[2018-02-27 05:44:39.957] [UaClient] [info] ua_client | creating session ...
[2018-02-27 05:44:39.987] [UaClient] [info] ua_client | create session OK
[2018-02-27 05:44:39.987] [UaClient] [info] ua_client | activating session ...
[2018-02-27 05:44:40.018] [UaClient] [info] ua_client | activate session OK
[2018-02-27 05:44:40.026] [UaClient] [info] keep_alive_thread | starting
[2018-02-27 05:44:40.096] [UaClient] [info] keep_alive_thread | stopped
QWARN : Tst_QOpcUaClient::getChildren(freeopcua) [ 13.495 W] qt.opcua.plugins.freeopcua unknown - Could not disconnect from endpoint: Response timed out
FAIL! : Tst_QOpcUaClient::getChildren(freeopcua) QTestLib: This test case check ("(((opcuaClient->state() == QOpcUaClient::Disconnected)))") failed because the requested timeout (5000 ms) was too short, 9900 ms would have been sufficient this time.
Loc: [tst_client.cpp(92)]
PASS : Tst_QOpcUaClient::cleanupTestCase()
[2018-02-27 05:44:50.151] [UaClient] [error] binary_client | ReceiveThread: error receiving data: Connection was closed by host. Success.
Totals: 3 passed, 1 failed, 0 skipped, 0 blacklisted, 13559ms
********* Finished testing of Tst_QOpcUaClient *********
Makefile:274: recipe for target 'check' failed
make: *** [check] Error 1