Remove pysqlite requirement
Remove pysqlite requirement

pysqlite installation is failing in the devstack gate.  We don't need
any pysqlite features anyway, so we should use sqlite3 from the stdlib
instead.

Change-Id: I7b069e54ac9615bc94eb9cb53b2d46b7b35bef6e

cloudkeep/barbican,openstack/barbican,cneill/barbican,openstack/barbican,cloudkeep/barbican,cneill/barbican,MCDong/barbican,MCDong/barbican