Add command to change password of logged in user

tests/unittests/xmpp/stub_xmpp.c

@@ -62,6 +62,12 @@ connection_get_barejid(void)
     return mock_ptr_type(char*);
 }
 
+char*
+connection_get_user(void)
+{
+    return mock_ptr_type(char*);
+}
+
 const char*
 connection_get_domain(void)
 {
@@ -393,6 +399,10 @@ void
 iq_command_exec(const char* const target, const char* const command)
 {
 }
+void
+iq_register_change_password(const char* const user, const char* const password)
+{
+}
 
 // caps functions
 void