Fix example and tests based on review comments

Add the missing "source" intermediate key in the example and test case,
and ensure the VM information isn't shadowed by later steps.

plugins/modules/azure_rm_galleryimageversion.py

@@ -326,9 +326,10 @@
           storage_account_type: Standard_LRS
     storage_profile:
       os_disk:
-        resource_group: myResourceGroup
-        storage_account: myStorageAccount
-        uri: "https://myStorageAccount.blob.core.windows.net/myContainer/myImage.vhd"
+        source:
+          resource_group: myResourceGroup
+          storage_account: myStorageAccount
+          uri: "https://myStorageAccount.blob.core.windows.net/myContainer/myImage.vhd"
 '''
 
 RETURN = '''

tests/integration/targets/azure_rm_gallery/tasks/main.yml

@@ -109,7 +109,7 @@
   azure_rm_virtualmachine_info:
     resource_group: "{{ resource_group }}"
     name: "vmforimage{{ rpfx }}"
-  register: output
+  register: vm_output
 
 - name: Create a snapshot by importing an unmanaged blob from the same subscription.
   azure_rm_snapshot:
@@ -118,7 +118,7 @@
     location: eastus
     creation_data:
       create_option: Import
-      source_uri: 'https://{{ output.vms[0].storage_account_name }}.blob.core.windows.net/{{ output.vms[0].storage_container_name }}/{{ output.vms[0].storage_blob_name }}'
+      source_uri: 'https://{{ vm_output.vms[0].storage_account_name }}.blob.core.windows.net/{{ vm_output.vms[0].storage_container_name }}/{{ vm_output.vms[0].storage_blob_name }}'
   register: output
 
 - name: Assert the snapshot created
@@ -372,10 +372,11 @@
               disk_encryption_set_id: "{{ des_results.state.id }}"
           storage_account_type: Standard_ZRS
     storage_profile:
-      source_image:
-        resource_group: "{{ resource_group }}"
-        storage_account: '{{ output.vms[0].storage_account_name }}'
-        uri: 'https://{{ output.vms[0].storage_account_name }}.blob.core.windows.net/{{ output.vms[0].storage_container_name }}/{{ output.vms[0].storage_blob_name }}'
+      os_disk:
+        source:
+          resource_group: "{{ resource_group }}"
+          storage_account: '{{ vm_output.vms[0].storage_account_name }}'
+          uri: 'https://{{ vm_output.vms[0].storage_account_name }}.blob.core.windows.net/{{ vm_output.vms[0].storage_container_name }}/{{ vm_output.vms[0].storage_blob_name }}'
   register: output
 
 - name: Assert the gallery image version created