(cherry picked from commit 81af5336acf4c765ef1201e7762d003ae0b0011e) Conflicts: tests/qemuxml2argvdata/qemuxml2argv-bios.args tests/qemuxml2argvdata/qemuxml2argv-disk-copy_on_read.args tests/qemuxml2argvdata/qemuxml2argv-disk-ioeventfd.args tests/qemuxml2argvdata/qemuxml2argv-event_idx.args tests/qemuxml2argvdata/qemuxml2argv-hyperv.args tests/qemuxml2argvdata/qemuxml2argv-virtio-lun.args
This patch teaches testutil how to read multi-line input files with backspace-newline line continuation markers. The patch also breaks up all the single-line arguments test input files into multi-line files with lines shorter than 80 characters.