Remove unused optparse code in trove.db
Remove unused optparse code in trove.db

add_options in trove.db is not used for a long time, and this is the
same situation fofr optparse in python 2.7, so we can safely remove
this part from trove.db.

Closes-Bug: #1553030
Change-Id: I17228eed5c122bce49ce80ec665fe73d6caa1e04
Signed-off-by: Zhao Chao <abb6a2f7e4fabebf6d227485f53d7acf834f1da2@gmail.com>

openstack/trove,openstack/trove