Fix blank line issues reported by flake8

- E301 expected 1 blank line
- E302 expected 2 blank lines
- E303 too many blank lines
- E305 expected 2 blank lines after class or function definition
- E306 expected 1 blank line before a nested definition

Fixed automatically with autopep8:

  git ls-files | grep py$ | xargs autopep8 --in-place \
    --select E301,E302,E303,E305,E306

Manually fix issues in project.py caused by misuse of block comments.

Change-Id: Iee840fcaff48aae504ddac9c3e76d2acd484f6a9
Reviewed-on: https://gerrit-review.googlesource.com/c/git-repo/+/254599
Reviewed-by: Mike Frysinger <vapier@google.com>
Tested-by: David Pursehouse <dpursehouse@collab.net>

gitc_utils.py

@@ -29,12 +29,15 @@ from error import ManifestParseError
 
 NUM_BATCH_RETRIEVE_REVISIONID = 32
 
+
 def get_gitc_manifest_dir():
   return wrapper.Wrapper().get_gitc_manifest_dir()
 
+
 def parse_clientdir(gitc_fs_path):
   return wrapper.Wrapper().gitc_parse_clientdir(gitc_fs_path)
 
+
 def _set_project_revisions(projects):
   """Sets the revisionExpr for a list of projects.
 
@@ -63,6 +66,7 @@ def _set_project_revisions(projects):
                                (proj.remote.url, proj.revisionExpr))
     proj.revisionExpr = revisionExpr
 
+
 def _manifest_groups(manifest):
   """Returns the manifest group string that should be synced
 
@@ -77,6 +81,7 @@ def _manifest_groups(manifest):
     groups = 'default,platform-' + platform.system().lower()
   return groups
 
+
 def generate_gitc_manifest(gitc_manifest, manifest, paths=None):
   """Generate a manifest for shafsd to use for this GITC client.
 
@@ -140,6 +145,7 @@ def generate_gitc_manifest(gitc_manifest, manifest, paths=None):
   # Save the manifest.
   save_manifest(manifest)
 
+
 def save_manifest(manifest, client_dir=None):
   """Save the manifest file in the client_dir.