Cosmosdb pitr timestamp fixes

[kavskalyan]

---

1. Making utc as the default timezone when the timezone is not provided for the restore timestamps
2. Added the --name parameter to az cosmosdb restorable-database-account list to return all the restorable database accounts with the given name
3. Updating the sdk to the released version.

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[yonzhan]

Cosmosdb

[kavskalyan]

@evelyn-ys Can you please review this PR. Thanks :)

[evelyn-ys]

Have you updated setup.py to upgrade version?

[kavskalyan]

Have you updated setup.py to upgrade version?

Missed it. Upgraded it now.