Add global signal handler for Interrupt signal

[povsister]

What type of PR is this?

/kind bug
/sig node

What this PR does / why we need it:

Fix Ctrl+C not working with "crictl logs -f" command.
Switch to the global signal handler in following commands:

• crictl port-forward
• crictl stats -w

Which issue(s) this PR fixes:

Fixes #673

Special notes for your reviewer:

This PR also introduces a global Interrupt signal handling mechanism for long-running commands.
When programmer calls SetupInterruptSignalHandler(), a global read-only stopCh is returned.
Behind the scene:

• It setups a global signal handler monitoring Interrupt signals.
• The stopCh will be closed when Interrupt signal received.
• The current program exits immediately on receiving the Interrupt signal twice.
• No behavior change if SetupInterruptSignalHandler() is not called.

Does this PR introduce a user-facing change?

"crictl logs -f" command now can be stopped with Ctrl+C

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[povsister]

Just new to crictl, remind me if I am missing other long-running commands which also require signal handling.

[povsister]

/cc @feiskyer @saschagrunert

[cprivitere]

/auto-cc

[saschagrunert]

/lgtm
/hold
PTAL @feiskyer

[k8s-ci-robot]

[APPROVALNOTIFIER] This PR is APPROVED

This pull-request has been approved by: povsister, saschagrunert

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[feiskyer]

LGTM, thanks for adding this

/hold cancel