bpo-34605: Avoid master/slave terms (GH-9101)

* Replace "master process" with "parent process"
* Replace "master option mappings" with "main option mappings"
* Replace "master pattern object" with "main pattern object"
* ssl: replace "master" with "server"
* And some other similar changes
diff --git a/Lib/distutils/command/install.py b/Lib/distutils/command/install.py
index 0258d3de..41bf4bb 100644
--- a/Lib/distutils/command/install.py
+++ b/Lib/distutils/command/install.py
@@ -223,7 +223,7 @@
 
     def finalize_options(self):
         """Finalizes options."""
-        # This method (and its pliant slaves, like 'finalize_unix()',
+        # This method (and its pliant childs, like 'finalize_unix()',
         # 'finalize_other()', and 'select_scheme()') is where the default
         # installation directories for modules, extension modules, and
         # anything else we care to install from a Python module