Rename client_opt.i to wsman-client_opt.i since rdoc sorts alphabetically :-/

Due to alphabetic sorting ClientOptions (the class) comes before
Openwsman (the module) and rdoc fails to recognize ClientOptions as
Openwsman::ClientOptions :-/
diff --git a/bindings/openwsman.i b/bindings/openwsman.i
index bcc98ea..4416de1 100644
--- a/bindings/openwsman.i
+++ b/bindings/openwsman.i
@@ -471,7 +471,7 @@
 
 %include "wsman-transport.i"
 
-%include "client_opt.i"
+%include "wsman-client_opt.i"
 
 %include "wsman-client.i"
 
diff --git a/bindings/client_opt.i b/bindings/wsman-client_opt.i
similarity index 100%
rename from bindings/client_opt.i
rename to bindings/wsman-client_opt.i