Make blackbox-exporter launcher a clickable link

[clcollins]

This PR makes the output of the blackbox-exporter launcher script output a clickable link in the style of the cluster-console script.

Signed-off-by: Chris Collins collins.christopher@gmail.com

[clcollins]

/retest

[rendhalver]

Nice! Thanks Chris! Copied it into my container and it's working as expected.

[~ {prod} ]$ ocm backplane login osd-v4stg-aws
[~ {prod} (osd-v4stg-aws.z9a9.p1:default)]$ ./scratch/bin/blackbox-exporter 
== Blackbox exporter is available at http://127.0.0.1:38501 ==
Handling connection for 9999

/lgtm

[openshift-ci[bot]]

[APPROVALNOTIFIER] This PR is APPROVED

This pull-request has been approved by: clcollins, rendhalver

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[rendhalver]

/retest

[rendhalver]

The builds look to be failing on the gpg key for the gcloud-sdk repo. We aren't using that and we can install it from backplane-tools anyway so we will do that. Step one is in #290.

[rendhalver]

/retest