Increase timeout for checkstyle run

Change-Id: I27c6ce33b52b4860221f2e1994b9b0f6562462d6
diff --git a/bucklets/onos.bucklet b/bucklets/onos.bucklet
index 03b13a9..2e2fa17 100644
--- a/bucklets/onos.bucklet
+++ b/bucklets/onos.bucklet
@@ -45,7 +45,7 @@
                     '$(location //tools/build/conf:checkstyle-xml)',
                     '$(location //tools/build/conf:suppressions-xml)',
                     ],
-                test_rule_timeout_ms = 20000,
+                test_rule_timeout_ms = 45000,
                 labels = [ 'checkstyle' ],
         )