Fix indentation issues reported by flake8

- E121 continuation line under-indented for hanging indent
- E122 continuation line missing indentation or outdented
- E125 continuation line with same indent as next logical line
- E126 continuation line over-indented for hanging indent
- E127 continuation line over-indented for visual indent
- E128 continuation line under-indented for visual indent
- E129 visually indented line with same indent as next logical line
- E131 continuation line unaligned for hanging indent

Fixed automatically with autopep8:

  git ls-files | grep py$ | xargs autopep8 --in-place \
    --select E121,E122,E125,E126,E127,E128,E129,E131

Change-Id: Ifd95fb8e6a1a4d6e9de187b5787d64a6326dd249
Reviewed-on: https://gerrit-review.googlesource.com/c/git-repo/+/254605
Reviewed-by: Mike Frysinger <vapier@google.com>
Tested-by: David Pursehouse <dpursehouse@collab.net>

project.py

@@ -2341,7 +2341,7 @@ class Project(object):
     else:
       branch = self.revisionExpr
     if (not self.manifest.IsMirror and is_sha1 and depth
-        and git_require((1, 8, 3))):
+            and git_require((1, 8, 3))):
       # Shallow checkout of a specific commit, fetch from that commit and not
       # the heads only as the commit might be deeper in the history.
       spec.append(branch)