Issue #16, fix 'dnaprotocol' tests broken on Solaris

Same problem that broke most of the 'dnahelper' test fixtures; the dnahelper
script was using #!/bin/sh, which on Solaris is not Bash.

tests/dnaprotocol

@@ -146,8 +146,8 @@ setup_multi_helper() {
    setup_servald
    assert_no_servald_processes
    dnahelper="$TFWTMP/dnahelper"
-   cat >"$dnahelper" <<'EOF'
-#!/bin/sh
+   echo "#!$BASH" >"$dnahelper"
+   cat >>"$dnahelper" <<'EOF'
 echo STARTED
 while read line
 do