obsdiscovery: enforce the config on the server too
Right now, setting 'experimental.evolution.obsdiscovery=no' disable obsolescence
markers discovery on client only. The server still advertise discovery related
capabilities.
We now also honor the config on the server side.
#require test-repo pyflakes
Copied from Mercurial core (60ee2593a270)
$ cd "`dirname "$TESTDIR"`"
run pyflakes on all tracked files ending in .py or without a file ending
(skipping binary file random-seed)
$ hg locate 'set:(**.py or grep("^#!.*python")) - removed()' 2>/dev/null \
> | xargs pyflakes 2>/dev/null