Automated g4 rollback of commit 3e5edafa2a04a71cd3596e929e83222da725f3f9.

*** Reason for rollback ***

Likely cause for b/38172480 ("blaze now waits for all processes spawned by local tests to terminate") and b/38194553 ("Server terminated abruptly (error code: 14, error message: 'Endpoint read failed'").

I have a fix almost ready, but it consists of many lines of new code - we shouldn't rush that into Bazel's 0.5.0 release. Instead, let's roll this back, do a release using the known good older process-wrapper and then go forward in 0.5.1 with a better and well tested new version of this.

*** Original change description ***

process-wrapper: Wait for all (grand)children before exiting.

This uses Linux's PR_SET_CHILD_SUBREAPER and FreeBSD's PROC_REAP_ACQUIRE features to become an init-like process for all (grand)children spawned by process-wrapper, which allows us to a) kill them reliably and then b) wait for them reliably. Before this change, we only killed the main child, waited for it, then fired off a kill -9 on the process group, without waiting for it. This led to a race condition where Bazel would try to use...

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PiperOrigin-RevId: 156068188

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