fix CLI for single revisions

The CLI unconditionally passes all argument to rev-list, even if the argument
is a single commit rather than a revision range. This causes the CLI to always
analyse the entire git history up to the given commit, rather than just that
commit.

The web mode does not have this problem, and this fix copies the pattern used
there.

Introduced in d601e35.

Author: robhoes

git-deps.py

@@ -703,7 +703,11 @@ def cli(options, args):
         options.multi = True
 
     for revspec in args:
-        revs = GitUtils.rev_list(revspec)
+        if '..' in revspec:
+            revs = GitUtils.rev_list(revspec)
+        else:
+            revs = [revspec]
+
         if len(revs) > 1:
             options.multi = True