Rostest canopen_master test fails occasionally

[cschindlbeck]

I am running a CI with rostest and canopen_master sometimes fails with

[==========] Running 1 test from 1 test suite.
[----------] Global test environment set-up.
[----------] 1 test from TestNode
[ RUN      ] TestNode.testInitandShutdown
Debug:   socketcan_interface: send: 0#8201
Debug:   socketcan_interface: receive: 701#00
Debug:   socketcan_interface: send: 601#2b17100064000000
Debug:   socketcan_interface: receive: 581#6017100000000000
Debug:   socketcan_interface: send: 0#0101
Debug:   socketcan_interface: receive: 701#05
Debug:   socketcan_interface: send: 601#2b17100000000000
Debug:   socketcan_interface: receive: 581#6017100000000000
Debug:   socketcan_interface: send: 0#0201
pure virtual method called
terminate called without an active exception