rename master branch

[posriniv]

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/cc @gyliu513 @morvencao

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[gyliu513]

/lgtm

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[APPROVALNOTIFIER] This PR is APPROVED

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[ibm-ci-bot]

@posriniv: Updated the job-config configmap in namespace default using the following files:

• key IBM.ibm-iam-policy-operator.main.yaml using file ``
• key IBM.ibm-iam-policy-operator.master.yaml using file prow/cluster/jobs/IBM/ibm-iam-policy-operator/IBM.ibm-iam-policy-operator.master.yaml

In response to this:

What this PR does / why we need it:

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 #

Specify your PR reviewers:

/cc @gyliu513 @morvencao

Special notes for your reviewer:

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

Release note:

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