Make integration tests clean up after themselves. am: b448c34bfd

Original change: https://android-review.googlesource.com/c/platform/build/soong/+/1675873

Change-Id: I6cdc7926ffad56a949d182559750732e75c48121

tests/lib.sh

@@ -54,7 +54,7 @@ function setup() {
     mkdir -p "$MOCK_TOP"
   else
     MOCK_TOP=$(mktemp -t -d st.XXXXX)
-    trap 'echo cd / && echo rm -fr "$MOCK_TOP"' EXIT
+    trap 'cd / && rm -fr "$MOCK_TOP"' EXIT
   fi
 
   echo "Test case: ${FUNCNAME[1]}, mock top path: $MOCK_TOP"