add component metadata to all CTS module configs

Bug: 36140955
Bug: 35360169
Test: new unit test to ensure that all modules have this field
Change-Id: Id856f93c0d2a018be65bff33459b4b703d23257d
diff --git a/tests/cts/hostside/AndroidTest.xml b/tests/cts/hostside/AndroidTest.xml
index 9945805..ad7f81b 100644
--- a/tests/cts/hostside/AndroidTest.xml
+++ b/tests/cts/hostside/AndroidTest.xml
@@ -14,6 +14,7 @@
      limitations under the License.
 -->
 <configuration description="Config for CTS net host test cases">
+    <option name="config-descriptor:metadata" key="component" value="networking" />
     <test class="com.android.compatibility.common.tradefed.testtype.JarHostTest" >
         <option name="jar" value="CtsHostsideNetworkTests.jar" />
         <option name="runtime-hint" value="3m56s" />