Oort configuration via properties file + AWS

Added the possibility to configure oort via a properties file.
Added AWS nodes discovery.
Disabling OORT by removing properties file
minor bug fixes
fixed wrong property rmiRemotePeerAddress
Added the missing OortAwsConfigurer.start() call
code clean up and log improovements
refactored OortPropertiesFile classes hierachy
Merge branch '2.9.x-aws' into 2.9.x