Authorization: Add role assignment paging for list calls

[namratab]

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[markcowl]

on demand run here: http://azuresdkci.cloudapp.net/view/1-AzurePowerShell/job/powershell-on-demand/258/

[markcowl]

@namratab please pull the latest from the dev branch to make the on-demand run succeed

[namratab]

Done, thanks !

[namratab]

@markcowl I have kicked off an on-demand to get in the queue http://azuresdkci.cloudapp.net/view/1-AzurePowerShell/job/powershell-on-demand/
Looks like there is a long queue for both Powershell and on-demand jobs - I pulled from dev about 30 minutes ago and my powershell job is still waiting for a machine.

[hovsepm]

On-Demand job - http://azuresdkci.cloudapp.net/view/1-AzurePowerShell/job/powershell-on-demand/275/