tests/350-no-option-specfile done through -n

getting bogged down in implementation details (tape.expected)
is not necessary, the -n option is representative.
tests/520-firstball/.bs-update w/o duplication

same test() as in tests/fakes
tests for post-option-processing code w/o clutter

basically, the first half of bs-update.in has
bsu_configuration_processing=1, the rest of the code is
under bsu_configuration_processing=0.

the asymmetry in tests/fakes:test irks me, but it's not that much
of a deal as all tests for the option/argument-handling code use
BSU_QUIET_FAKE=1 already/anyway.
all fakes are quiet under bsu_configuration_processing=1

tests/5[015]0-*/tape.expected lose weight because they haven't
had BSU_QUIET_FAKE=1 either.
rnt updated to 14ca3728be4f117a6dd4a7b3961681b1a2ead531

    commit 14ca3728be4f117a6dd4a7b3961681b1a2ead531
    Merge: 7ca71d8 774c4dd
    Author: Roman Neuhauser <rneuhauser@suse.cz>
    Date:   Thu Apr 3 15:01:37 2014 +0200

        Merge branch 'stable-order-exitcode'

        * stable-order-exitcode:
          run-test.sh does not diff things twice
          run-test.sh outputs diffs in stable order