BUG-509: internal cleanup

Spell-check internal class and make it static
Make sure we don't have null name in contructor
Make sure we don't have null executor in constructor
getIdentifier() should be final

Change-Id: Ib8ebe82106d953581738bccbe1d4b878f9520b5b
Signed-off-by: Robert Varga <rovarga@cisco.com>