Improve test suite to skip FD test when hitting memory limit #278
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This changeset improves the test suite to skip the FD test when hitting the memory limit. This is particularly useful when testing systems with a low memory limit in place and Docker which defaults to a very large number of FDs, thus potentially requiring a lot of memory.
The changes have been ported from reactphp/child-process#90
Builds on top of #236
Refs #277 and others