add SKIP_KNOWN_BUGS and SKIP_INTERNET_TESTS to testsuite

Signed-off-by: Denys Vlasenko <vda.linux@googlemail.com>
diff --git a/testsuite/wget/wget-retrieves-google-index b/testsuite/wget/wget-retrieves-google-index
index 7be9a80..f9dbb8b 100644
--- a/testsuite/wget/wget-retrieves-google-index
+++ b/testsuite/wget/wget-retrieves-google-index
@@ -1,2 +1,4 @@
+test x"$SKIP_INTERNET_TESTS" != x"" && exit
+
 busybox wget -q -O foo http://www.google.com/
 test -s foo