SYSDB: Convert cached domain 'enumerated' attribute from bool to uint
    
    Currently only the 'id' provider setup enumeration tasks and uses this
    attribute, but other providers (or future ones) should be able to enumerate
    idependently from each other.
    
    The has_enumerated attribute in the domain cache entry is converted to a uint
    to store a bitmap indicating which provider has enumerated.
    
    Signed-off-by: Samuel Cabrero <scabrero@suse.de>
    
    Reviewed-by: Pavel Březina <pbrezina@redhat.com>