tests: don't load strip extension via mq extension for remotefilelog tests
The proper way to get the `hg strip` command has been via the "strip"
extension since 2013.
Differential Revision: https://phab.mercurial-scm.org/D5250
# This config file points Mercurial at the system-wide certificate
# store from the ca-certificates package.
[web]
cacerts = /etc/ssl/certs/ca-certificates.crt