Update dump manager and entry to have multiple types

Created a base dump entry, who ever implementing a new
dump type need to inherit from the base dump entry.

Signed-off-by: Dhruvaraj Subhashchandran <dhruvaraj@in.ibm.com>
Change-Id: Ie85d393f75ec697a7b02b84d131a4a8c0116c3e7