Explore inserting virtual media on legacy iDRACs

[drewwalters96]

Problem description (if applicable)
The remotedirect feature is unsupported on older iDRACs, e.g. 2.60.60.60 because those iDRACs only support GET requests on Redfish virtual media endpoints.

Proposed change
Create a legacy driver/client that directly inserts the media on older iDRACs by using the OEM endpoints, if it's possible to do so.

Potential impacts
The legacy driver will need to inherit from the existing Dell client, which inherits from the generic Redfish client.

[drewwalters96]

2.63 iDRAC version has been incompatible with metal3. Closing this for now as supporting this version of iDRAC in airshipctl will not add any value at this point.