Change order of the labs exercise for module 3

[cmoulliard]

The order of the labs of the module 3 does not follow the order of the slides presented within the course.

1. Create an Exclusive Consumer
2. Create a Hierarchical Chat
3. Create Message Groups
4. Create Prioritized Exclusive Consumer
5. Create Virtual Destinations

Should be

1. Create an Exclusive Consumer
2. Create Prioritized Exclusive Consumer
3. Create Message Groups
4. Create a Hierarchical Chat
5. Create Virtual Destinations

[satyaj]

fixed the order in the lab instructions.