mgr/cephadm: Disable external snapshots in grafana

[aaSharma14]

This PR intends to disable the external snapshots in grafana to reduce security threats

Signed-off-by: Aashish Sharma aasharma@redhat.com

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Checklist

• Tracker (select at least one)
  • References tracker ticket
  • Very recent bug; references commit where it was introduced
  • New feature (ticket optional)
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  • Affects Dashboard, opened tracker ticket
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  • Updates relevant documentation
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  • Includes unit test(s)
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[epuertat]

LGTM! Thanks @aaSharma14

[aaSharma14]

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