fix pip install (#7170)

(cherry picked from commit f48ac62)

# Conflicts:
#	requirements/extra.txt

Author: Borda

pytorch_lightning/setup_tools.py

@@ -33,7 +33,7 @@ def _load_requirements(path_dir: str, file_name: str = 'requirements.txt', comme
         if comment_char in ln:
             ln = ln[:ln.index(comment_char)].strip()
         # skip directly installed dependencies
-        if ln.startswith('http'):
+        if ln.startswith('http') or '@http' in ln:
             continue
         if ln:  # if requirement is not empty
             reqs.append(ln)

requirements/extra.txt

@@ -8,4 +8,4 @@ torchtext>=0.5
 onnxruntime>=1.3.0
 hydra-core>=1.0
 # todo: when switch to standard package stream, drop `fairscale` from hard mocked docs libs
-fairscale @ https://github.com/PyTorchLightning/fairscale/archive/pl_1.2.0.zip
+fairscale @https://github.com/PyTorchLightning/fairscale/archive/pl_1.2.0.zip