Fix to mosquitto spec file: add conflict with default mosquitto package

rpm/libmosquitto-dcdb-1.5.5.spec

@@ -13,6 +13,8 @@ Packager: DCDB project <info@dcdb.it>
 Buildroot: %{_tmppath}/%{name}-%{version}-root
 BuildRequires: gcc-c++
 BuildRequires: openssl-devel
+Conflicts: mosquitto
+Conflicts: mosquitto-devel
 
 %description
 Mosquitto is an open source implementation of the MQ Telemetry Transport