Add SetNoWhiteSpace and SetTablePadding options to have more kubectl like output

[shreddedbacon]

Description

This adds the ability to output table data much more like kubectl by removing the white space at the start of rows. It also introduces a padding option so you can choose either spaces or tab as the padding between columns

An example has been added to the README, but is posted here for visibility

A test has also been written

Example

ExampleSet KubeFormat option

data := [][]string{
    {"node1.example.com", "Ready", "compute", "1.11"},
    {"node2.example.com", "Ready", "compute", "1.11"},
    {"node3.example.com", "Ready", "compute", "1.11"},
    {"node4.example.com", "NotReady", "compute", "1.11"},
}

table := tablewriter.NewWriter(os.Stdout)
table.SetHeader([]string{"Name", "Status", "Role", "Version"})
table.SetAutoWrapText(false)
table.SetAutoFormatHeaders(true)
table.SetHeaderAlignment(tablewriter.ALIGN_LEFT)
table.SetAlignment(tablewriter.ALIGN_LEFT)
table.SetCenterSeparator("")
table.SetColumnSeparator("")
table.SetRowSeparator("")
table.SetHeaderLine(false)
table.SetBorder(false)
table.SetTablePadding("\t") // pad with tabs
table.SetNoWhiteSpace(true)
table.AppendBulk(data) // Add Bulk Data
table.Render()

Output

NAME             	STATUS  	ROLE   	VERSION 
node1.example.com	Ready   	compute	1.11   	
node2.example.com	Ready   	compute	1.11   	
node3.example.com	Ready   	compute	1.11   	
node4.example.com	NotReady	compute	1.11   	

Closes

This PR should close #129

[shreddedbacon]

@olekukonko @mattn can you please review.
All tests passed

[woodcockjosh]

@shreddedbacon looks good. do we need to make this kubernetes specific? Can we just keep it generic with something like "table padding" option?

[shreddedbacon]

I guess it doesn't have to be kube specific, but all the requests for this sort of feature were to be more kubectl like, which was also what I was after.

Happy to rename it to something else if you have an idea, these are the two options added, and they sort of need to work together. You can't really use it outside of what is in the example I posted.

table.SetKubePadding()
table.SetKubeFormat()

Ideas for renaming?

[woodcockjosh]

Yeah I also want for the same reason but this library shouldn't be concerned with specific use cases in that it has knowledge of them, rather it should implement capabilities that enable them.

I think
table.SetTablePadding("") will get us all what we need. The other formatting like left align, etc can be achieved with existing methods.

[shreddedbacon]

Sweet, thanks @woodcockjosh I've made adjustments like suggested.
How does it look now?

[mattn]

Looks good. @woodcockjosh thought?

[woodcockjosh]

Looks great!

[mattn]

Thank you

[woodcockjosh]

When release?

[shreddedbacon]

🎉 Awesome, thank you!

[mattn]

I'll tag soon.