Avoid mixing new and old sharding

explicitly disable dynamic sharding part of new sharding in
defautl cts.

Test: unit tests, run cts -m CtsGestureTestCases --shards 2
Change-Id: I738f08b705620666e8bca1b05631f1caeede39c2
diff --git a/common/host-side/tradefed/res/config/common-compatibility-config.xml b/common/host-side/tradefed/res/config/common-compatibility-config.xml
index 0006203..501940d 100644
--- a/common/host-side/tradefed/res/config/common-compatibility-config.xml
+++ b/common/host-side/tradefed/res/config/common-compatibility-config.xml
@@ -14,6 +14,7 @@
      limitations under the License.
 -->
 <configuration description="Common config for Compatibility suites">
+    <option name="dynamic-sharding" value="false" />
     <device_recovery class="com.android.tradefed.device.WaitDeviceRecovery" />
     <build_provider class="com.android.compatibility.common.tradefed.build.CompatibilityBuildProvider" />
     <test class="com.android.compatibility.common.tradefed.testtype.CompatibilityTest" />