Enhancements to Redfishtool to support Sensor and Inventory listing

[yadlapati]

We are looking to enhance redfishtool to add support for additional functions since these functions are either not supported, or require multiple commands to get this data or the output is not very user friendly.

For example:

• single option to list all sensors
• single option to list all inventory
• list error logs (enhance output format)
• Create, list, delete and extract dumps

[mraineri]

@yadlapati your pull request should address the first two bullets. Are you planning on providing further enhancements for the second two?