Enable pep8 H405 tests

Enabled H405 multi line docstring summary not separated with an empty
line in tox testing.

Change-Id: I1a4bfbd2bad6eb2c132843ca21451807737121df
Closes-Bug:#1524176

pbr/core.py

@@ -75,8 +75,10 @@ else:
 
 
 def pbr(dist, attr, value):
-    """Implements the actual pbr setup() keyword.  When used, this should be
-    the only keyword in your setup() aside from `setup_requires`.
+    """Implements the actual pbr setup() keyword.
+
+    When used, this should be the only keyword in your setup() aside from
+    `setup_requires`.
 
     If given as a string, the value of pbr is assumed to be the relative path
     to the setup.cfg file to use.  Otherwise, if it evaluates to true, it

pbr/packaging.py

@@ -634,10 +634,12 @@ def _get_version_from_pkg_metadata(package_name):
 
 
 def get_version(package_name, pre_version=None):
-    """Get the version of the project. First, try getting it from PKG-INFO or
-    METADATA, if it exists. If it does, that means we're in a distribution
-    tarball or that install has happened. Otherwise, if there is no PKG-INFO
-    or METADATA file, pull the version from git.
+    """Get the version of the project.
+
+    First, try getting it from PKG-INFO or METADATA, if it exists. If it does,
+    that means we're in a distribution tarball or that install has happened.
+    Otherwise, if there is no PKG-INFO or METADATA file, pull the version
+    from git.
 
     We do not support setup.py version sanity in git archive tarballs, nor do
     we support packagers directly sucking our git repo into theirs. We expect

tox.ini

@@ -34,6 +34,6 @@ commands = {posargs}
 # H405  multi line docstring summary not separated with an empty line
 # H904 "Wrap lines in parentheses and not a backslash for line continuation
 # Removed in current hacking (https://review.openstack.org/#/c/101701/).
-ignore = H405,H803,H904
+ignore = H803,H904
 exclude = .venv,.tox,dist,doc,*.egg,build
 show-source = true