buildman: Add an option to specify the buildman config file

Add a new --config-file option (-G) to specify a different configuration
file from the default ~/.buildman.

Reported-by: Tom Rini <trini@ti.com>
Signed-off-by: Simon Glass <sjg@chromium.org>

tools/buildman/buildman.py

@@ -83,6 +83,8 @@ parser.add_option('-F', '--force-build-failures', dest='force_build_failures',
        help='Force build of previously-failed build')
 parser.add_option('-g', '--git', type='string',
        help='Git repo containing branch to build', default='.')
+parser.add_option('-G', '--config-file', type='string',
+       help='Path to buildman config file', default='')
 parser.add_option('-H', '--full-help', action='store_true', dest='full_help',
        default=False, help='Display the README file')
 parser.add_option('-i', '--in-tree', dest='in_tree',

tools/buildman/control.py

@@ -86,7 +86,7 @@ def DoBuildman(options, args):
     """
     gitutil.Setup()
 
-    bsettings.Setup()
+    bsettings.Setup(options.config_file)
     options.git_dir = os.path.join(options.git, '.git')
 
     toolchains = toolchain.Toolchains()