[1LP][RFR] Fix provider filters in test_power_control_rest module

[tpapaioa]

Fixed provider parametrization in test_power_control_rest.py so that the following uncollections no longer happen:

test_stop_vm_rest[satellite-6.2-small_template-from_detail] - Config Manager providers do not support this feature.
test_start_vm_rest[satellite-6.2-small_template-from_detail] - Config Manager providers do not support this feature.
test_suspend_vm_rest[satellite-6.2-small_template-from_detail] - Config Manager providers do not support this feature.
test_stop_vm_rest[satellite-6.2-small_template-from_collection] - Config Manager providers do not support this feature.
test_start_vm_rest[satellite-6.2-small_template-from_collection] - Config Manager providers do not support this feature.
test_suspend_vm_rest[satellite-6.2-small_template-from_collection] - Config Manager providers do not support this feature.
test_stop_vm_rest[ansible_tower-3.4-small_template-from_detail] - Config Manager providers do not support this feature.
test_start_vm_rest[ansible_tower-3.4-small_template-from_detail] - Config Manager providers do not support this feature.
test_suspend_vm_rest[ansible_tower-3.4-small_template-from_detail] - Config Manager providers do not support this feature.
test_stop_vm_rest[ansible_tower-3.4-small_template-from_collection] - Config Manager providers do not support this feature.
test_start_vm_rest[ansible_tower-3.4-small_template-from_collection] - Config Manager providers do not support this feature.
test_suspend_vm_rest[ansible_tower-3.4-small_template-from_collection] - Config Manager providers do not support this feature.
test_stop_vm_rest[ansible_tower-3.5-small_template-from_detail] - Config Manager providers do not support this feature.
test_start_vm_rest[ansible_tower-3.5-small_template-from_detail] - Config Manager providers do not support this feature.
test_suspend_vm_rest[ansible_tower-3.5-small_template-from_detail] - Config Manager providers do not support this feature.
test_stop_vm_rest[ansible_tower-3.5-small_template-from_collection] - Config Manager providers do not support this feature.
test_start_vm_rest[ansible_tower-3.5-small_template-from_collection] - Config Manager providers do not support this feature.
test_suspend_vm_rest[ansible_tower-3.5-small_template-from_collection] - Config Manager providers do not support this feature.
test_reset_vm_rest[small_template-from_detail] - Parametrization of fixture ['provider'] for cfme.tests.cloud_infra_common.test_power_control_rest.test_reset_vm_rest yielded no values, marking for uncollection.
test_reset_vm_rest[small_template-from_collection] - Parametrization of fixture ['provider'] for cfme.tests.cloud_infra_common.test_power_control_rest.test_reset_vm_rest yielded no values, marking for uncollection.

The 'Config Manager' uncollections are resolved by using a provider filter to exclude ConfigManager providers, instead of using a separate uncollectif mark.

The last two uncollections were due to an incorrect passing of classes to ProviderFilter, which is now fixed as well.

{{ pytest: -vv cfme/tests/cloud_infra_common/test_power_control_rest.py }}