Add missing command and options in bash completion
    
    Some options and commands are missed in bash completion. This patch
    adds global options --release, --name, --namespace and a few others
    options to fedpkg and subcommands.
    
    Subcommand override can be completed now, but not its second level
    subcommands and options.
    
    Signed-off-by: Chenxiong Qi <cqi@redhat.com>