correctly count errors/failures in PyTorch test summary

[casparvl]

Fix #2802 using improved regex

[casparvl]

Test report by @casparvl

Overview of tested easyconfigs (in order)

• SUCCESS PyTorch-1.11.0-foss-2021a-CUDA-11.3.1.eb

Build succeeded for 1 out of 1 (1 easyconfigs in total)
gcn27 - Linux RHEL 8.4, x86_64, Intel(R) Xeon(R) Platinum 8360Y CPU @ 2.40GHz, 4 x NVIDIA NVIDIA A100-SXM4-40GB, 515.43.04, Python 3.6.8
See https://gist.github.com/40f95f8538d787f0c4a062539f22a177 for a full test report.

[casparvl]

Test report by @casparvl

Overview of tested easyconfigs (in order)

• SUCCESS PyTorch-1.11.0-foss-2021a-CUDA-11.3.1.eb

Build succeeded for 1 out of 1 (1 easyconfigs in total)
software2.lisa.surfsara.nl - Linux debian 10.13, x86_64, Intel(R) Xeon(R) Bronze 3104 CPU @ 1.70GHz, 4 x NVIDIA NVIDIA TITAN V, 470.103.01, Python 3.7.3
See https://gist.github.com/4db43494a647aafc4f4729fe033c7fdd for a full test report.

[boegel]

lgtm