superproject: added 'implies -c' in the help of --use-superproject option.

sync.py: deleted unused import errno.

Tested:
$ ./run_tests
$ flake8 repo subcmds/sync.py

Bug: https://crbug.com/gerrit/15208
Change-Id: I2bb3098f5602ded3861e000100766041ad93b53d
Reviewed-on: https://gerrit-review.googlesource.com/c/git-repo/+/322555
Reviewed-by: Mike Frysinger <vapier@google.com>
Tested-by: Raman Tenneti <rtenneti@google.com>

1 files changed, 1 insertions, 1 deletions

diff --git a/repo b/repo
index 4cddbf1e..2af77ace 100755
--- a/repo
+++ b/repo
@@ -372,7 +372,7 @@ def InitParser(parser, gitc_init=False):
                    help='filter for use with --partial-clone '
                         '[default: %default]')
   group.add_option('--use-superproject', action='store_true', default=None,
-                   help='use the manifest superproject to sync projects')
+                   help='use the manifest superproject to sync projects; implies -c')
   group.add_option('--no-use-superproject', action='store_false',
                    dest='use_superproject',
                    help='disable use of manifest superprojects')