Replace --min-sdk-version with shorter and less confusing --min-api flag.

R=sgjesse

Change-Id: Iaf5eaf91d33dc3b89a148d7cf8c7a8305c88fc1d
diff --git a/tools/test_framework.py b/tools/test_framework.py
index 7ef5ff3..810935d 100755
--- a/tools/test_framework.py
+++ b/tools/test_framework.py
@@ -92,7 +92,7 @@
       tool_file = DX_JAR
     else:
       tool_file = D8_JAR
-      tool_args = ['--output', temp_dir, '--min-sdk-version', MIN_SDK_VERSION]
+      tool_args = ['--output', temp_dir, '--min-api', MIN_SDK_VERSION]
       if args.tool == 'd8-release':
         tool_args.append('--release')