Add LocationCompleter to Compute cmdlets

[maddieclayton]

Description

• Add LocationCompleter to Compute cmdlets with -Location parameters
• Document issues

[cormacpayne]

@maddieclayton work with the Compute team to get this into their generator

CC: @huangpf @hyonholee

[maddieclayton]

Updated description:

• Add the LocationCompleterAttribute with correct Provider/Resource type to each generated cmdlet with the -Location parameter.
• Regenerate the files and test functionality

[maddieclayton]

Done