stream-clone: add the `-exp` prefix to the bundle part
We forget to do so in 58adcabc295f, however this is important to prevent
"current" client to send incompatible version to future client.
fixbundle() {
grep -v 'saving bundle' | grep -v 'saved backup' | \
grep -v added | grep -v adding | \
grep -v "unable to find 'e' for patching" | \
grep -v "e: No such file or directory" | \
cat
}