Add quotes to prevent shell globbing in TESTING.asciidoc

TESTING.asciidoc

@@ -285,14 +285,14 @@ REST tests use the following command:
 
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 gradle :distribution:integ-test-zip:integTest   \
-  -Dtests.class=org.elasticsearch.test.rest.*Yaml*IT
+  -Dtests.class="org.elasticsearch.test.rest.*Yaml*IT"
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 A specific test case can be run with
 
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 gradle :distribution:integ-test-zip:integTest \
-  -Dtests.class=org.elasticsearch.test.rest.*Yaml*IT \
+  -Dtests.class="org.elasticsearch.test.rest.*Yaml*IT" \
   -Dtests.method="test {p0=cat.shards/10_basic/Help}"
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