OAK-454: Make In Memory/H2 MicroKernal depend explicit configuration to activate

No need to copy the config file around, just use it from source location.
Also added the missing license header.

git-svn-id: https://svn.apache.org/repos/asf/jackrabbit/oak/trunk@1431306 13f79535-47bb-0310-9956-ffa450edef68