extensions: move uisetup and extsetup to standalone functions
This is to make them wrap-able. chgserver wants to know if an extension
accesses config or environment variables during uisetup and extsetup and
include them in confighash accordingly.
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
}