Batch cmdlets for terminating job schedules, jobs, and tasks

[jasper-schneider]

3 new cmdlets:
Stop-AzureBatchJobSchedule
Stop-AzureBatchJob
Stop-AzureBatchTask

Includes test updates and help.

[azurecla]

Hi @jasper-schneider, I'm your friendly neighborhood Azure Pull Request Bot (You can call me AZPRBOT). Thanks for your contribution!

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[markcowl]

@azuresdkci retest this please

[jasper-schneider]

Test errors don't look related to my changes. How would you like me to proceed?

"D:\workspace\powershell\build.proj" (Full target) (1) ->
(InvokeXUnit target) ->
D:\workspace\powershell\AzurePowershell.test.targets(83,5): error MSB3073: The command "D:\workspace\powershell\packages\xunit.runner.console.2.0.0\tools\xunit.console.x86.exe ".\src\ResourceManager\Compute\Commands.Compute.Test\bin\Debug\Microsoft.Azure.Commands.Compute.Test.dll" -trait "AcceptanceType=CheckIn" -html ".\src\Publish\TestResults\Microsoft.Azure.Commands.Compute.Test.html"" exited with code 1. [D:\workspace\powershell\build.proj]

"D:\workspace\powershell\build.proj" (Full target) (1) ->
(TimeoutErrorHandler target) ->
D:\workspace\powershell\AzurePowershell.test.targets(99,5): error : XUnit tests in assembly "Microsoft.Azure.Commands.AzureBackup.Test.dll" failed or timed out. Ensure that all tests in a project pass and collectively take less than 1 minute to run. [D:\workspace\powershell\build.proj]

[markcowl]

@azuresdkci retest this please

[markcowl]

on-dmeand run is here: http://azuresdkci.cloudapp.net/view/1-AzurePowerShell/job/powershell-on-demand/165/

[markcowl]

@jasper-schneider Please add these changes to the changelog

[jasper-schneider]

Updated changelog to include these cmdlets as well as some cmdlets that were added last week.

[markcowl]

on demand run here: http://azuresdkci.cloudapp.net/view/1-AzurePowerShell/job/powershell-on-demand/169/