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>

git_config.py

@@ -59,18 +59,23 @@ ID_RE = re.compile(r'^[0-9a-f]{40}$')
 
 REVIEW_CACHE = dict()
 
+
 def IsChange(rev):
   return rev.startswith(R_CHANGES)
 
+
 def IsId(rev):
   return ID_RE.match(rev)
 
+
 def IsTag(rev):
   return rev.startswith(R_TAGS)
 
+
 def IsImmutable(rev):
     return IsChange(rev) or IsId(rev) or IsTag(rev)
 
+
 def _key(name):
   parts = name.split('.')
   if len(parts) < 2:
@@ -79,6 +84,7 @@ def _key(name):
   parts[-1] = parts[-1].lower()
   return '.'.join(parts)
 
+
 class GitConfig(object):
   _ForUser = None
 
@@ -392,6 +398,7 @@ _master_keys = set()
 _ssh_master = True
 _master_keys_lock = None
 
+
 def init_ssh():
   """Should be called once at the start of repo to init ssh master handling.
 
@@ -401,6 +408,7 @@ def init_ssh():
   assert _master_keys_lock is None, "Should only call init_ssh once"
   _master_keys_lock = _threading.Lock()
 
+
 def _open_ssh(host, port=None):
   global _ssh_master
 
@@ -479,6 +487,7 @@ def _open_ssh(host, port=None):
   finally:
     _master_keys_lock.release()
 
+
 def close_ssh():
   global _master_keys_lock
 
@@ -503,15 +512,18 @@ def close_ssh():
   # We're done with the lock, so we can delete it.
   _master_keys_lock = None
 
+
 URI_SCP = re.compile(r'^([^@:]*@?[^:/]{1,}):')
 URI_ALL = re.compile(r'^([a-z][a-z+-]*)://([^@/]*@?[^/]*)/')
 
+
 def GetSchemeFromUrl(url):
   m = URI_ALL.match(url)
   if m:
     return m.group(1)
   return None
 
+
 @contextlib.contextmanager
 def GetUrlCookieFile(url, quiet):
   if url.startswith('persistent-'):
@@ -552,6 +564,7 @@ def GetUrlCookieFile(url, quiet):
     cookiefile = os.path.expanduser(cookiefile)
   yield cookiefile, None
 
+
 def _preconnect(url):
   m = URI_ALL.match(url)
   if m:
@@ -572,9 +585,11 @@ def _preconnect(url):
 
   return False
 
+
 class Remote(object):
   """Configuration options related to a remote.
   """
+
   def __init__(self, config, name):
     self._config = config
     self.name = name
@@ -735,6 +750,7 @@ class Remote(object):
 class Branch(object):
   """Configuration options related to a single branch.
   """
+
   def __init__(self, config, name):
     self._config = config
     self.name = name