Port ipa-replica-prepare to the admintool framework
    
    Break the script into several smaller methods.
    
    Use modern idioms: os.path.join instead of string addition; the with statement
    for closing files.
    
    Add --quiet, --verbose, and --log-file options. Use logging instead of print
    statements. (http://freeipa.org/page/V3/Logging_and_output)
    
    Part of: https://fedorahosted.org/freeipa/ticket/2652
    Fixes: https://fedorahosted.org/freeipa/ticket/3285