httpservice: move sys.exit() out of serve_forever()
This is a simple refactoring to show the callers of the method, so
it's easier to reason about the impact of removing the `sys.exit()`
calls in subsequent patches.
Differential Revision: https://phab.mercurial-scm.org/D9270
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
}