Problem Description
======================
sed: append fail to autoinsert newline

$ echo -ne "woot" | busybox sed '/woot/a woo'
wootwoo

Expected Behavior
======================
$ echo -ne "woot" | busybox sed '/woot/a woo'
woot
woo

looks like it is a known issue?
in testsuite/sed.tests:
test x"$SKIP_KNOWN_BUGS" = x"" && {
testing "sed append autoinserts newline" "sed -e '/woot/a woo' -" \
        "woot\nwoo\n" "" "woot"
}