stream-clone: split the stream part out of test-persistent-nodemap.t
We want to test multiple variants, so let's make it an independent test.
Small adaptations and simplifications are needed in the test output as the
tested repository is now shorter.
#require docutils gettext
Error: the current ro localization has some rst defects exposed by
moving pager to core. These two warnings about references are expected
until the localization is corrected.
$ $TESTDIR/check-gendoc ro
checking for parse errors
gendoc.txt:58: (WARNING/2) Inline interpreted text or phrase reference start-string without end-string.
gendoc.txt:58: (WARNING/2) Inline interpreted text or phrase reference start-string without end-string.