Create alternatives for lower case and dot separated config properties

[rlenferink]

Currently there are still some config property which must be set with lower case and dot separated property names. Because Celix falls back on env variables if a config property is not set in the config.properties file, a more env variable convention is preferable.

Track down all config properties using lower case and dot separation (e.g. cosgi.auto.start.1) and add an upper case and _ separation alternative. Also for Celix property add the prefix celix (e.g. CELIX_AUTO_START_1).

Note that the lower case and dot separation config property should still be supported to ensure backward compatibility.

[rlenferink]

Resolution: Fixed