Fix ServicePrincipalName misnaming in new-azurermroleassignment command

[darshanhs90]

Fix to the following issue #1166

Description

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[cormacpayne]

@darshanhs90 I believe the user from the issue is suggesting that ServicePrincipalName be renamed to ApplicationId. If that is the case, then we rename the parameter to ApplicationId and add an alias to ServicePrincipalName. What do you think?

[darshanhs90]

sure sounds good

[darshanhs90]

will update the pr once this [ https://github.com//pull/5023 ] gets merged,since i would need to rerecord the tests once i change the parameter

[cormacpayne]

@darshanhs90 that PR has been merged

[cormacpayne]

On-demand: https://azuresdkci.westus2.cloudapp.azure.com/job/powershell-demand/263/