mbs: Use base module stream when resolving dependencies
    
    When a module for a particular release is requested, its dependencies
    should not be pulled from newer release.
    
    This is achieved by adding a filter for base_module_br_stream_version,
    which has to be at most the same as for the requested module. We also
    add a requirement that the same major version has to be used.
    
    JIRA: RHELCMP-4592