CLOUDIFY-1532 Add logger levels getters

- Add EnumStringTranslator abstraction.
- Added error/warn/info overloads using enums + tests.
- Switch assertions from hamcrest to fest.
CLOUDIFY-1532 Add logger levels getters

- Add ResourceBundleEnumStringTranslator implementation + tests.
CLOUDIFY-1532 Add logger levels getters

- Added LogMessage interface, using it instead of enum as abstraction, renamed related classes & tests.