Allocator test isn't working well with opensplice and fastrtps

[ivanpauno]

Bug report

• Operating System:
  Ubuntu 18.04
• Installation type:
  From source
• Version or commit hash:
  a9f131b (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.