cleanup: remove useless re-raises of KeyboardInterrupt
KeyboardInterrupt is no longer a subclass of Exception since Python 2.5.
https://docs.python.org/2/whatsnew/2.5.html#pep-352-exceptions-as-new-style-classes
# This config file points Mercurial at the system-wide certificate
# store from the ca-certificates package.
[web]
cacerts = /etc/ssl/certs/ca-certificates.crt