Fix requirements after socketio client refactoring.

Refactored to get a single source of truth on the requirements.
Had to fix issues related to the import of gazu in setup.py

requirements.txt

@@ -1,5 +1 @@
-python-socketio[client]==5.2.1; python_version == "2.7"
-python-socketio[client]==5.3.0; python_version == "3.5"
-python-socketio[client]==5.4.0; python_version > "3.5"
-requests==2.26.0
-deprecated==1.2.13
+-e .[dev,test]

setup.cfg

@@ -27,9 +27,11 @@ classifiers =
 zip_safe = False
 packages = find:
 install_requires =
-    socketio-client==0.7.2
-    deprecated==1.1.0
-    requests==2.24.0
+    python-socketio[client]==5.2.1; python_version == "2.7"
+    python-socketio[client]==5.3.0; python_version == "3.5"
+    python-socketio[client]==5.4.0; python_version > "3.5"
+    deprecated==1.2.13
+    requests==2.26.0
 
 [options.packages.find]
 # ignore gazutest directory

setup.py

@@ -1,6 +1,15 @@
 #!/usr/bin/env python
+import ast
+import re
+import os
+
 from setuptools import setup
 
-from gazu.__version__ import __version__
+
+# We hack our way into getting the version from gazu without imports :
+# running gazu/__init__.py would cause errors due to the import of dependencies yet to be installed
+versionpath = os.path.join(os.path.dirname(__file__), "gazu/__version__.py")
+with open(versionpath, "r") as file:
+    __version__ = ast.literal_eval(re.search('__version__ *= *(\S+)', file.read()).group(1))
 
 setup()