A denser logging format for REEF that is similar to the standard SimpleFormatter.
The following config properties are available:
* `org.apache.reef.util.logging.ThreadLogFormatter.format`
is a format string for String.format() that takes same arguments and in
the same order as the standard SimpleFormatter, plus the thread name:
1. date
2. class and method name
3. logger name
4. logging level
5. message
6. stack trace
7. thread name
* `org.apache.reef.util.logging.ThreadLogFormatter.dropPrefix`
contains a comma-separated list of package name prefixes that should be
removed from the class name for logging. e.g. value `com.microsoft.,org.apache.`
will have the formatter write class `org.apache.reef.util.logging.Config` as
`reef.util.logging.Config`. (Note the dot at the end of the prefix).