Progress tracking support for dump entries.

A new attribute status is added which indicates the status of the
dump creation. The user requested dump entries will be created
with InProgress and updated to Completed once the dump creation
is completed

Test: Request user initiated BMC and system dump and
make sure the progress is changing and the dump details
are updated correctly

Signed-off-by: Dhruvaraj Subhashchandran <dhruvaraj@in.ibm.com>
Change-Id: I68e25c865765dff97913af00bf89c8c3a4b65d43