[wip] bootkube.sh: handle retry of etcd-signer gracefully

[hexfusion]

Issues covered by this PR.

Lets not print scary errors like the below

Error: Failed to evict container: "": Failed to find container "etcd-signer" in state: no container with name or ID etcd-signer found: no such container

Instead in error lets just print

Tearing down etcd-signer container

The trap is setup to make sure we try and remove etcd-signer container on error. Which serves its purpose. But after the bootstrap etcd has started lets not restart the signer if bootkube restarts. This way we can ensure signer is not competing with apiserver for ports.

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[wip] bootkube.sh: handle retry of etcd-signer gracefully

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[openshift-ci-robot]

@hexfusion: No Bugzilla bug is referenced in the title of this pull request.
To reference a bug, add 'Bug XXX:' to the title of this pull request and request another bug refresh with /bugzilla refresh.

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In response to this:

[wip] bootkube.sh: handle retry of etcd-signer gracefully

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Test name	Commit	Details	Rerun command
ci/prow/e2e-aws	a7d75c8	link	/test e2e-aws
ci/prow/e2e-openstack	a7d75c8	link	/test e2e-openstack
ci/prow/e2e-aws-scaleup-rhel7	a7d75c8	link	/test e2e-aws-scaleup-rhel7
ci/prow/e2e-ovirt	a7d75c8	link	/test e2e-ovirt

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[hexfusion]

Going with full solution #4150