Reduce project dependencies, move LogSearch+Solr and AMS into their own projects

Today, Ambari Metrics System and LogSearch+Solr are deployed as part of the ambari repo. This was a good way to bootstrap these features, but as they continue to scale, we want to reduce the dependencies between these projects and the rest of Ambari, especially since AMS and LogSearch are far more closely associated with the stack than Ambari itself.

For this reason, we need to split out these projects into their own Java maven projects and repos. This will help us deliver code faster and decrease dependencies.

In the future, we should also be mindful about accepting large code donations that may make better since to split out.