tests: verify the stricter numeric option parser

Test 1409 and 1410 verifies the stricter numeric option parser
introduced the other day in commit f2b6ebed7b.

tests/data/test1410

@@ -0,0 +1,30 @@
+<testcase>
+<info>
+<keywords>
+cmdline
+</keywords>
+</info>
+
+
+#
+# Client-side
+<client>
+<server>
+none
+</server>
+ <name>
+Pass in negative number to --max-time
+ </name>
+ <command>
+http://%HOSTIP:%HTTPPORT/1410 --max-time -4
+</command>
+</client>
+
+#
+# Verify data after the test has been "shot"
+<verify>
+<errorcode>
+2
+</errorcode>
+</verify>
+</testcase>