TUN-4356: Set AUTOMAXPROCS to the CPU limit when running in a Linux container

vendor/go.uber.org/automaxprocs/CHANGELOG.md

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+# Changelog
+
+## v1.4.0 (2021-02-01)
+
+- Support colons in cgroup names.
+- Remove linters from runtime dependencies.
+
+## v1.3.0 (2020-01-23)
+
+- Migrate to Go modules.
+
+## v1.2.0 (2018-02-22)
+
+- Fixed quota clamping to always round down rather than up; Rather than
+  guaranteeing constant throttling at saturation, instead assume that the
+  fractional CPU was added as a hedge for factors outside of Go's scheduler.
+
+## v1.1.0 (2017-11-10)
+
+- Log the new value of `GOMAXPROCS` rather than the current value.
+- Make logs more explicit about whether `GOMAXPROCS` was modified or not.
+- Allow customization of the minimum `GOMAXPROCS`, and modify default from 2 to 1.
+
+## v1.0.0 (2017-08-09)
+
+- Initial release.