(cobra) Add TLS options to all cobra commands and classes. Add example to the doc.

ixcobra/ixcobra/IXCobraMetricsPublisher.h

@@ -15,6 +15,8 @@
 
 namespace ix
 {
+    struct SocketTLSOptions;
+
     class CobraMetricsPublisher
     {
     public:
@@ -43,7 +45,8 @@ namespace ix
                        const std::string& channel,
                        const std::string& rolename,
                        const std::string& rolesecret,
-                       bool enablePerMessageDeflate);
+                       bool enablePerMessageDeflate,
+                       const SocketTLSOptions& socketTLSOptions);
 
         /// Setter for the list of blacklisted metrics ids.
         /// That list is sorted internally for fast lookups