Ensure curl package

[sp-ricard-valverde]

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https://github.com/voxpupuli/puppet-python/blob/adf223e5c03c9f3cc0e59d233e9ed08768fc38d4/manifests/pip/bootstrap.pp#L36

This assumes curl is installed, but it should be added as a package requirement. Furthermore the command will return a 0 successful code if the python binary is present but curl is not, masking the failure and making puppet think the Exec resource applied successfully.

Same here: https://github.com/voxpupuli/puppet-python/blob/adf223e5c03c9f3cc0e59d233e9ed08768fc38d4/manifests/pip/bootstrap.pp#L52