##### SUMMARY
When creating a VM with unmanaged disks, VHD URIs must be specified. As explained in the online [Azure VHD documentation](https://docs.microsoft.com/en-us/azure/marketplace/cloud-partner-portal/virtual-machine/cpp-deploy-json-template), the URI is created with __http__ as scheme. When VM facts are retrieved, the URI set at deployment time are correctly retrieved, untouched.

Unfortunately, when it comes to delete the VM, in the module's __extract_names_from_blob_uri__ method, the code validates the URI using a regexp that only considers __https__ as a valid scheme.

##### ISSUE TYPE
- Bug Report

##### COMPONENT NAME
* azure_rm_virtualmachine

##### ANSIBLE VERSION
```paste below
ansible 2.8.5
  config file = /home/***/ansible/ansible_dev.cfg
  configured module search path = [u'/home/***/ansible/library']
  ansible python module location = /home/***/ansible/.venv/lib/python2.7/site-packages/ansible
  executable location = /home/***/ansible/.venv/bin/ansible
  python version = 2.7.5 (default, Jun 11 2019, 14:33:56) [GCC 4.8.5 20150623 (Red Hat 4.8.5-39)]
```

##### CONFIGURATION
```paste below
DEFAULT_BECOME_METHOD(/home/***/ansible/ansible_dev.cfg) = sudo
DEFAULT_BECOME_USER(/home/***/ansible/ansible_dev.cfg) = root
DEFAULT_GATHER_TIMEOUT(/home/***/ansible/ansible_dev.cfg) = 30
DEFAULT_HOST_LIST(/home/***/ansible/ansible_dev.cfg) = [u'/home/***/ansible/inventory/azure-dev']
DEFAULT_LOG_PATH(/home/***/ansible/ansible_dev.cfg) = /home/***/ansible.log
DEFAULT_MODULE_PATH(/home/***/ansible/ansible_dev.cfg) = [u'/home/***/ansible/library']
DEFAULT_ROLES_PATH(/home/***/ansible/ansible_dev.cfg) = [u'/home/***/ansible/roles']
DEFAULT_VAULT_IDENTITY_LIST(/home/***/ansible/ansible_dev.cfg) = []
HOST_KEY_CHECKING(/home/***/ansible/ansible_dev.cfg) = False
INVENTORY_ENABLED(/home/***/ansible/ansible_dev.cfg) = [u'yaml', u'azure_rm', u'script']
RETRY_FILES_ENABLED(/home/***/ansible/ansible_dev.cfg) = False
```

##### OS / ENVIRONMENT
Controller: RHEL 7.4

##### STEPS TO REPRODUCE
* Deploy a new VM using the following ARM template: https://docs.microsoft.com/en-us/azure/marketplace/cloud-partner-portal/virtual-machine/cpp-deploy-json-template
* Use azure_rm_virtualmachine to delete the VM using the __state: absent__

##### EXPECTED RESULTS
The module runs w/o any errors and the VHD disks are deleted.

##### ACTUAL RESULTS
The module fails with the following error:
```json
{
"msg": "Error parsing blob URI unable to parse blob uri 'http://my-sa.blob.core.windows.net/vhds/my-vm_osdisk.vhd'",
    "changed": false,
    "_ansible_no_log": false
}
```

if self.os_type == 'Linux':
                        if disable_ssh_password and not self.ssh_public_keys:
                            self.fail("Parameter error: ssh_public_keys required when disabling SSH password.")
                    if not image_reference:
                        self.fail("Parameter error: an image is required when creating a virtual machine.")
                    availability_set_resource = None
                    if self.availability_set:
                        parsed_availability_set = parse_resource_id(self.availability_set)
                        availability_set = self.get_availability_set(parsed_availability_set.get('resource_group', self.resource_group),
                                                                     parsed_availability_set.get('name'))
                        availability_set_resource = self.compute_models.SubResource(id=availability_set.id)
                        if self.zones:
                            self.fail("Parameter error: you can't use Availability Set and Availability Zones at the same time")
                    
                    if not self.network_interface_names:
                        default_nic = self.create_default_nic()
                        self.log("network interface:")
                        self.log(self.serialize_obj(default_nic, 'NetworkInterface'), pretty_print=True)
                        network_interfaces = [default_nic.id]
                    
                    if not self.storage_account_name and not self.managed_disk_type:
                        storage_account = self.create_default_storage_account()
                        self.log("os disk storage account:")
                        self.log(self.serialize_obj(storage_account, 'StorageAccount'), pretty_print=True)
                        requested_storage_uri = 'https://{0}.blob.{1}/'.format(
                            storage_account.name,
                            self._cloud_environment.suffixes.storage_endpoint)
                        requested_vhd_uri = '{0}{1}/{2}'.format(
                            requested_storage_uri,
                            self.storage_container_name,