reworked php7.3 stack

* replace previous stack php7 variables
* properly set stack php = php7.2 and php73 = php7.3
* rename upstream php72 and php73 to avoid issues when migrating from EEv3
* use unix socket in nginx upstream instead of TCP/IP

setup.py

@@ -58,7 +58,7 @@ if not os.path.isfile('/root/.gitconfig'):
       shutil.copy2(os.path.expanduser("~")+'/.gitconfig', '/root/.gitconfig')
 
 setup(name='wo',
-      version='3.9.1',
+      version='3.9.5',
       description=long_description,
       long_description=long_description,
       classifiers=[],