buildman: Convert camel case in bsettings.py

Convert this file to snake case and update all files which use it.

Signed-off-by: Simon Glass <sjg@chromium.org>
diff --git a/tools/buildman/bsettings.py b/tools/buildman/bsettings.py
index 029c401..f7f8276 100644
--- a/tools/buildman/bsettings.py
+++ b/tools/buildman/bsettings.py
@@ -7,7 +7,7 @@
 
 config_fname = None
 
-def Setup(fname=''):
+def setup(fname=''):
     """Set up the buildman settings module by reading config files
 
     Args:
@@ -23,15 +23,15 @@
             config_fname = '%s/.buildman' % os.getenv('HOME')
         if not os.path.exists(config_fname):
             print('No config file found ~/.buildman\nCreating one...\n')
-            CreateBuildmanConfigFile(config_fname)
+            create_buildman_config_file(config_fname)
             print('To install tool chains, please use the --fetch-arch option')
         if config_fname:
             settings.read(config_fname)
 
-def AddFile(data):
+def add_file(data):
     settings.readfp(io.StringIO(data))
 
-def GetItems(section):
+def get_items(section):
     """Get the items from a section of the config.
 
     Args:
@@ -47,7 +47,7 @@
     except:
         raise
 
-def GetGlobalItemValue(name):
+def get_global_item_value(name):
     """Get an item from the 'global' section of the config.
 
     Args:
@@ -58,7 +58,7 @@
     """
     return settings.get('global', name, fallback=None)
 
-def SetItem(section, tag, value):
+def set_item(section, tag, value):
     """Set an item and write it back to the settings file"""
     global settings
     global config_fname
@@ -68,7 +68,7 @@
         with open(config_fname, 'w') as fd:
             settings.write(fd)
 
-def CreateBuildmanConfigFile(config_fname):
+def create_buildman_config_file(config_fname):
     """Creates a new config file with no tool chain information.
 
     Args: