sig-cloud-provider: s/sig-<provider>-leads/provider-<provider> in OWNERS

[justaugustus]

Adds custom content OWNERS for former cloud provider SIG Chairs/TLs

There may have been a more elegant way to do this, but here's what I did:

for provider in "aws" "azure" "gcp" "ibmcloud" "openstack" "vmware"; do 
  for i in $(grep --exclude-dir=.git -lR sig-${provider}-leads .); do
    sed -i "s/sig-${provider}-leads/provider-${provider}/g" "$i";
  done
done

/assign @andrewsykim @nikhita

Ref: #3895, kubernetes/org#1050, kubernetes/org#1051

Signed-off-by: Stephen Augustus [email protected]

[nikhita]

@justaugustus is there a timeline for when the deprecated SIG READMEs/tombstones can be removed?

[justaugustus]

@justaugustus is there a timeline for when the deprecated SIG READMEs/tombstones can be removed?

@nikhita -- added tombstones for 1.17 in 4b02fa4.

[justaugustus]

/assign @parispittman @cblecker

[cblecker]

/lgtm
/approve

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