RecoveryServices.Backup Bugfixes

[dragonfly91]

Description

1. Fixed bug - Bug 1526979: Get-AzureRmRecoveryServicesBackupItem should do case insensitive comparison for container name filter
2. Fixed bug - AzureVmItem should have property displaying ServiceClientModel.AzureIaaSVMProtectedItem.LastBackupTime
3. Fixed bug - Make vault credential cmdlet test compulsory for Check-In
4. Improvement - made tests self-sustaining.

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[cormacpayne]

On-demand: https://azuresdkci.westus2.cloudapp.azure.com/job/powershell-demand/199/

[cormacpayne]

@dragonfly91 please update the change logs for RecoveryServices and RecoveryServices.Backup to reflect the changes being made in this PR

[cormacpayne]

@dragonfly91 if the only changes in this module were test changes, then you can go ahead and revert the changes made to this change log. There shouldn't be a need to ship another iteration of RecoveryServices if there were no changes impacting customers.

[dragonfly91]

Hi @cormacpayne I have undone my changes made to the RecoveryServices ChangeLog.md file. Can you please merge the PR?

[cormacpayne]

On-demand: https://azuresdkci.westus2.cloudapp.azure.com/job/powershell-demand/222/

[maddieclayton]

@twitchax looks like the travis build isn't running for this PR - is there an easy way to retrigger it?

[maddieclayton]

Closing and reopening to trigger the Travis job

[twitchax]

@maddieclayton, sorry, my bad for the delay. This PR needed a forward integrate from preview. I merged, and the CI should be kicked off now.

[maddieclayton]

No changes were made to common files that would break the netcore build, so I will just force merge this.