NO-ISSUE: Fix warning with wrap_if_ipv6

[bfournie]

Include network.sh so that wrap_if_ipv6 is defined properly.

[openshift-ci]

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[openshift-ci]

@bfournie: The following test failed, say /retest to rerun all failed tests or /retest-required to rerun all mandatory failed tests:

Test name	Commit	Details	Required	Rerun command
ci/prow/e2e-agent-compact-ipv4-iso-no-registry	7e521a3	link	false	/test e2e-agent-compact-ipv4-iso-no-registry

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