SDN-1492: Delete .rhel7 dockerfile

[tssurya]

Now that we have merged openshift/release#14990
and openshift-eng/ocp-build-data#808 we can go
ahead and remove the .rhel7 file.

As agreed on #24 , let's remove the extra Dockerfile and keep it clean.

/assign @danielmellado and @juanluisvaladas

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In response to this:

Now that we have merged openshift/release#14990
and openshift-eng/ocp-build-data#808 we can go
ahead and remove the .rhel7 file.

As agreed on #24 , let's remove the extra Dockerfile and keep it clean.

/assign @danielmellado and @juanluisvaladas

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[tssurya]

/hold

till openshift/release#14990 merges.

[juanluisvaladas]

/approve

[tssurya]

/hold cancel
/test e2e-aws

[danielmellado]

/approve

[danielmellado]

/lgtm

[openshift-ci-robot]

[APPROVALNOTIFIER] This PR is APPROVED

This pull-request has been approved by: danielmellado, juanluisvaladas, tssurya

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