commandserver: enable logging when server process started
This allows us to keep track of server events before client connects to
the server.
Tests will be added later. Currently there's no log() call to check if
things are working well.
test-commandserver: change way of triggering early crash
Future patches will move the logging facility out of the server class, so
cmdserver.log can't be (ab)used for this purpose. Instead, let's hook the
factory function to raise exception.
loggingutil: add basic logger backends
These classes will be used in command server. They are similar to
the blackboxlogger, but it can't be factored out since the blackbox is so
tightly coupled with a repo object.
hgweb: register web.comparisoncontext to the config table
This was caught in some server side logging added to debug py3 issues.
Added signature for changeset
1c8c54cf9725