Merge branch 'tr/maint-bundle-long-subject' into maint

* tr/maint-bundle-long-subject:
t5704: match tests to modern style
strbuf: improve strbuf_get*line documentation
bundle: use a strbuf to scan the log for boundary commits
bundle: put strbuf_readline_fd in strbuf.c with adjustments

diff --cc bundle.c
Simple merge

diff --cc strbuf.c
Simple merge

diff --cc strbuf.h
Simple merge