arcyd fetch: flush output and adjust format
arcyd fetch: flush output and adjust format

Ensure that you can tell which repo is being processed when running
'arcyd fetch' by flushing stdout before doing the slow operation.

Add a space before the ellipses ' ..' so it looks more like the repo
is being processed and less name has simply been truncated.

Test Plan:
$ ./precommit.sh
$ ./testbed/arcyd/test_shell.sh
    $ cd ../arcyd2
    $ arcyd fetch

valhallasw/phabricator-tools,bloomberg/phabricator-tools,kjedruczyk/phabricator-tools,cs-shadow/phabricator-tools,kjedruczyk/phabricator-tools,bloomberg/phabricator-tools,kjedruczyk/phabricator-tools,aevri/phabricator-tools,valhallasw/phabricator-tools,valhallasw/phabricator-tools,bloomberg/phabricator-tools,cs-shadow/phabricator-tools,aevri/phabricator-tools,valhallasw/phabricator-tools,bloomberg/phabricator-tools,kjedruczyk/phabricator-tools,cs-shadow/phabricator-tools,cs-shadow/phabricator-tools,aevri/phabricator-tools,kjedruczyk/phabricator-tools,aevri/phabricator-tools,bloomberg/phabricator-tools,aevri/phabricator-tools,cs-shadow/phabricator-tools