Remove JcloudsLocationFactory; add location-metadata.properties

- Instead of hardcoding metadata (e.g. lat/lon coordinates) in
  the JcloudsLocationFactory class, the BrooklynProperties looks up
  the location-metadata.properties file.
- Look up properties with prefix brooklyn.jclouds.<PROVIDER>:<REGION>.*
- Deleted deprecated (unused) CommandLineLocations
Add ISO_3166 config key
Jclouds properties: remove sanitize()