setting a max DB connect timeout of 1 second for pulp-manage-db

If a user runs pulp-manage-db while mongo is not listening for connections,
that user does not want the usual retry back-off. They want pulp-manage-db to
keep trying about once per second until a connection is established.
Merge pull request #1229 from pulp/mhrivnak-dbtimeout

setting a max DB connect timeout of 1 second for pulp-manage-db