[Tools] testbot/TestAgent: Better report invalid options.

Signed-off-by: Francois Gouget <[email protected]>
---
 testbot/scripts/TestAgent | 5 +++++
 1 file changed, 5 insertions(+)

diff --git a/testbot/scripts/TestAgent b/testbot/scripts/TestAgent
index bfc4fbc7..c4105561 100755
--- a/testbot/scripts/TestAgent
+++ b/testbot/scripts/TestAgent
@@ -152,6 +152,11 @@ while (@ARGV)
     {
         $RunFlags |= $TestAgent::RUN_DNTRUNC_ERR;
     }
+    elsif ($arg =~ /^-/)
+    {
+        error("unknown option '$arg'\n");
+        $Usage = 2;
+    }
     elsif (!defined $Hostname)
     {
         $Hostname = $arg;
-- 
2.14.2