Ignoring a node as a Service Grid deployment candidate

[Denis Magda]

Igniters,

Presently every node that is a part of a cluster listens for Service 
Grid assignment changes in order to find out whether a service has to be 
deployed on it or not.

However, there is a possible case when a node is not considered to be a 
target for service A at all during its lifetime. But the node has to 
have a class definition of service A in its classpath in any case just 
to check whether it's a target one or not.
In big cluster with many unrelated clients this can be an annoying thing 
to take care of.

My understanding is that it makes sense to implement "all or nothing" 
like approach for Service Grid cause it's the most easiest and 
straightforward.
If a service is considered to be deployed on node A at some point of 
time then node A has to have  class definitions of all the services in 
its classpath.
On the other hand if node B is not considered to be a deployment target 
for any service then it will be excluded from services deployment 
related logic. We can add a special parameter to IgniteConfiguration to 
address this.

What do you think on this approach? If we want to support more flexible 
configurations lets go ahead and discuss them here.

--
Denis