Allocator test isn't working well with opensplice and fastrtps

Bug report

• Operating System:
  Ubuntu 18.04
• Installation type:
  From source
• Version or commit hash:
  a9f131b4ba2fcf1978037f3fcd2fdbade0f87ed7 (realtime_support)
• DDS implementation:
  Opensplice and FastRTPS
• Client library (if applicable):
  rclcpp

Steps to reproduce issue

• Checkout rclcpp branch ivanpauno/fix_issue_#668 (4b23cf464dca6feb42f84c0a8cfb1afb74ac1231)
• Rebuild rclcpp and test_tlsf

colcon build --symlink-install --packages-up-to rclcpp test_tlsf

• Run test_tlsf

colcon test --packages-select test_tlsf

Expected behavior

The allocator_unique_ptr test fail for the three vendors.

Actual behavior

It's only failing in connext and passing in fastrtps and opensplice, when it shouldn't.

Additional information

This stack trace:

/home/ivanpauno/ros2_ws/build/tlsf_cpp/test_tlsf__rmw_opensplice_cpp : operator new(unsigned long)+0x3b

Is marked as match in check_stacktrace.
only because it contains opensplice in the test name. The same happens with fastrtps. It's not happening with connext, as is not part of the token list.

Start with tlsf_cpp/test/test_tlsf.cpp, especially check_stacktrace and the allocator_unique_ptr test, then reproduce with the listed colcon build and test commands. Trace how OpenSplice and FastRTPS are matched and make the test distinguish genuine allocator behavior from vendor names in the test path; done means the vendor results match the expected failures.