Disable Go runtime GC for starter process

[dtrudg]

Description of the Pull Request (PR):

This is an inelegant, but effective work around for #7 that will prevent GC cycle triggered errors until the effects of closing fds in container startup can be further considered for possible re-work.

Allow debug of Go runtime issues in starter

• Do not clear GOGC and GODEBUG in starter C init
• Log FD_CLOEXEC on fds

Disable GC for the starter

• Prevent a GC cycle firing after fds have been closed, which can cause
  a netpoll panic.

Co-authored-by: Adam Hughes tri-adam@users.noreply.github.com

This fixes or addresses the following GitHub issues:

• Fixes Infrequent GC related netpoll fd error after descriptors closed by starter #7

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• Read the Guidelines for Contributing, and this PR conforms to the stated requirements.
• Added changes to the CHANGELOG if necessary according to the Contribution Guidelines
• Added tests to validate this PR, linted with make check and tested this PR locally with a make test, and make testall if possible (see CONTRIBUTING.md).
• Based this PR against the appropriate branch according to the Contribution Guidelines
• Added myself as a contributor to the Contributors File