[etwist] pass the repository to the root resource
This is another step toward a cleaner instantiation scheme for the repo.
The http test now pass an already created object to the etwist server instead of
relying on the config cache.
Related to #2249513
import ConfigParser
try:
undo_actions = config.cfgfile_parser.get('MAIN', 'undo-support', False)
except ConfigParser.NoOptionError:
pass # this conf. file was probably already migrated
else:
config.global_set_option('undo-enabled', bool(undo_actions))