Description of configuration options for connection

Configuration option=Default value	Description
connection=sqlite:///$state_path/$sqlite_db	(StrOpt) The SQLAlchemy connection string used to connect to the database
connection_debug=0	(IntOpt) Verbosity of SQL debugging information. 0=None, 100=Everything
connection_trace=False	(BoolOpt) Add python stack traces to SQL as comment strings
connection_type=None	(StrOpt) Virtualization api connection type : libvirt, xenapi, or fake