Refactor controlnet and add img2img and inpaint

src/diffusers/pipelines/controlnet/pipeline_controlnet_inpaint.py

@@ -12,6 +12,7 @@
 # See the License for the specific language governing permissions and
 # limitations under the License.
 
+# This model implementation is heavily inspired by https://github.com/haofanwang/ControlNet-for-Diffusers/
 
 import inspect
 import os

tests/pipelines/controlnet/test_controlnet_img2img.py

@@ -13,6 +13,8 @@
 # See the License for the specific language governing permissions and
 # limitations under the License.
 
+# This model implementation is heavily inspired by https://github.com/haofanwang/ControlNet-for-Diffusers/
+
 import gc
 import random
 import tempfile

tests/pipelines/controlnet/test_controlnet_inpaint.py

@@ -13,6 +13,8 @@
 # See the License for the specific language governing permissions and
 # limitations under the License.
 
+# This model implementation is heavily based on:
+
 import gc
 import random
 import tempfile