Use IP to identify orphaned allocation to be deleted

[mlguerrero12]

• Del command should not fail when allocation is not found
• The IP uniquely identifies the correct orphaned allocation that needs to be deleted during IP reconcilation.

Fixes https://github.com/k8snetworkplumbingwg/whereabouts/issues/176

[coveralls]

Pull Request Test Coverage Report for Build 9204761188

Warning: This coverage report may be inaccurate.

This pull request's base commit is no longer the HEAD commit of its target branch. This means it includes changes from outside the original pull request, including, potentially, unrelated coverage changes.

• For more information on this, see Tracking coverage changes with pull request builds.
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• For a quick fix, rebase this PR at GitHub. Your next report should be accurate.

Details

• 21 of 45 (46.67%) changed or added relevant lines in 3 files are covered.
• 3 unchanged lines in 2 files lost coverage.
• Overall coverage increased (+0.2%) to 72.204%

---

Changes Missing Coverage	Covered Lines	Changed/Added Lines	%
pkg/reconciler/iploop.go	20	26	76.92%
cmd/whereabouts.go	1	9	11.11%
pkg/allocate/allocate.go	0	10	0.0%
<!--	Total:	21	45	46.67%	-->

Files with Coverage Reduction	New Missed Lines	%
pkg/allocate/allocate.go	1	63.74%
cmd/whereabouts.go	2	46.34%
<!--	Total:	3		-->

Totals
Change from base Build 9076868168:	0.2%
Covered Lines:	1130
Relevant Lines:	1565

---

💛 - Coveralls

[pliurh]

@mlguerrero12 It looks good to me. Just on a side note. Could you also change the function name of isPodAlive? It's misleading. It should be something likeisOrphanedIP.

[mlguerrero12]

@maiqueb, @pliurh, thanks for you comments. I addressed them. Please have a look again.