hubzero-filexfer: shell-script-fails-syntax-check

# filexfer, importfile and exportfile are helper commands invoked by the
# session tooling, not documented user-facing utilities; upstream ships no
# man pages for them.
hubzero-filexfer: no-manual-page [usr/bin/exportfile]
hubzero-filexfer: no-manual-page [usr/bin/filexfer]
hubzero-filexfer: no-manual-page [usr/bin/importfile]
