Add archive script that the bots can archive release versions

Move the path to d8 and r8 jar files into utils.

Bug:
Change-Id: Ibf584af6ba94c35a73829e87778a57984240e925
diff --git a/tools/test_framework.py b/tools/test_framework.py
index d511bcf..51c870a 100755
--- a/tools/test_framework.py
+++ b/tools/test_framework.py
@@ -30,7 +30,6 @@
 
 DX_JAR = os.path.join(utils.REPO_ROOT, 'tools', 'linux', 'dx', 'framework',
     'dx.jar')
-D8_JAR = os.path.join(utils.REPO_ROOT, 'build', 'libs', 'd8.jar')
 GOYT_EXE = os.path.join('third_party', 'goyt',
     'goyt_164843480')
 FRAMEWORK_JAR = os.path.join('third_party', 'framework',
@@ -85,7 +84,7 @@
       tool_file = DX_JAR
       xmx = '-Xmx1600m'
     else:
-      tool_file = D8_JAR
+      tool_file = utils.D8_JAR
       tool_args = ['--output', output_dir, '--min-api', MIN_SDK_VERSION]
       if args.tool == 'd8-release':
         tool_args.append('--release')