Add UT for ReconcileVPCSecurityGroups function

[arshadd-b]

What this PR does / why we need it:
Add UTs for ReconcileVPCSecurityGroups function and fixes minor bug found during writing UTs
Which issue(s) this PR fixes (optional, in fixes #<issue number>(, fixes #<issue_number>, ...) format, will close the issue(s) when PR gets merged):
Fixes #

Special notes for your reviewer:

/area provider/ibmcloud

1. Please confirm that if this PR changes any image versions, then that's the sole change this PR makes.

Release note:

Add UT for ReconcileVPCSecurityGroups function

[linux-foundation-easycla]

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• ✅ login: arshadd-b (f99fb44)

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[APPROVALNOTIFIER] This PR is NOT APPROVED

This pull-request has been approved by: arshadd-b
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[Amulyam24]

/easycla

[Amulyam24]

/ok-to-test

[Prajyot-Parab]

@arshadd-b Please update
What this PR does / why we need it:
&
Release note:

[Karthik-K-N]

/cc @dharaneeshvrd

[k8s-ci-robot]

PR needs rebase.

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