Correct cosmosdb info module when loading by resource group

[l3ender]

SUMMARY

This PR corrects the info module for cosmosdb to correctly filter by resource group.

Fixes #708

ISSUE TYPE

• Bugfix Pull Request

COMPONENT NAME

azure_rm_cosmosdbaccount_info

ADDITIONAL INFORMATION

The following playbook can be used to validate the test cases for the azure_rm_cosmosdbaccount_info module.

---
- name: "Playbook for testing."
  hosts: "localhost"
  connection: "local"
  gather_facts: false
  vars:
    resource_group: "automated-testing"
    resource_group_secondary: "automated-testing-secondary"
  collections:
    - azure.azcollection

  tasks:
    - name: "Include tests"
      include_tasks: "tests/integration/targets/azure_rm_cosmosdbaccount/tasks/main.yml"

[l3ender]

@Fred-sun A PR for a small bug I found in azure_rm_cosmosdbaccount_info module. Please review and advise--thank you!

[xuzhang3]

LGTM